EP1895868B1 - Precious, semi-precious or mineral cut stone and method for cutting same - Google Patents

Precious, semi-precious or mineral cut stone and method for cutting same Download PDF

Info

Publication number
EP1895868B1
EP1895868B1 EP06741306A EP06741306A EP1895868B1 EP 1895868 B1 EP1895868 B1 EP 1895868B1 EP 06741306 A EP06741306 A EP 06741306A EP 06741306 A EP06741306 A EP 06741306A EP 1895868 B1 EP1895868 B1 EP 1895868B1
Authority
EP
European Patent Office
Prior art keywords
crown
facets
facet
point
culet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06741306A
Other languages
German (de)
French (fr)
Other versions
EP1895868A1 (en
Inventor
Hiroyuki Koganei
Takehiko Sato
Misuzu Koganei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1895868A1 publication Critical patent/EP1895868A1/en
Application granted granted Critical
Publication of EP1895868B1 publication Critical patent/EP1895868B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C17/00—Gems or the like
    • A44C17/001—Faceting gems

Definitions

  • cut stones are well known (see for example the document US-2004/083759 ).
  • Stone observation devices are also known which make it possible to visualize an image by reflection of light through the diamond under particular lighting conditions (see, for example, JP 6174648 ).
  • the present invention aims to develop a cut stone does not have this disadvantage and thus allowing an observation of an undeformed image in an observation device according to the prior art.
  • the stone thus cut will have an improved gloss and, depending on its size, it will allow the projection of sharp images, different and original.
  • a stone as indicated at the beginning wherein said breech facets comprise at least one tip facet which extends between said acute colette and an intermediate location between the belt and the colette .
  • said tip facet extends from said acute colette to said intermediate location.
  • the tip facets do not extend to the waist. It therefore becomes possible to arrange them so as to be able to observe their image in the observation device according to the state of the art, without deformation, because it can no longer be reflected through facets of the crown, as in FIG. is currently the case with diamonds cut in the usual way.
  • a tip facet is, with respect to said colette, located opposite each said tip facet, so that a light projected through said crown at an angle predetermined by relation to the table undergoes a first reflection on a tip facet with projection of an image thereof to said opposite tip facet where the light undergoes a second reflection with projection of said image through the crown, and said intermediate location of each tip facet is disposed between the belt and colette so that the image of each peak facet from said second reflection is totally projected perpendicularly through the flat table of the crown.
  • the reflected image of the tip facets of the yoke is projected through the crown table, which is quite flat and perpendicular to the reflected rays, thus causing no optical deformation.
  • said at least one tip facet extends at an angle of 25 to 52 °, preferably 36 to 41 °, with respect to the table.
  • crown facets are arranged under a angle of 25 to 80 °, preferably 33 to 37 ° relative to the table and said tip facets extend at an angle of 40 to 41 ° with respect to the table.
  • the present invention also relates to a stone cutting method comprising a crown facetting having at its center a flat table surrounded by crown facets, a facetting of a cylinder head having an acute colette and a plurality of cylinder head facets and a formation of a belt between the crown and the cylinder head.
  • This method is characterized in that it comprises a size of at least one breech facet in the form of a tip facet which extends from the acute colette to an intermediate location between the belt and the colette.
  • cut diamonds The following description relates to cut diamonds. It should be understood that the present invention also relates to other cut stones, for example rubies, emeralds, etc.
  • the illustrated diamond comprises a crown 1 comprising in its center a flat table 2 surrounded by several facets of crown. These crown facets are, in the usual way, consisting of eight stars 3, eight bezels 4 and sixteen ring halves 5.
  • breech 6 has been illustrated. As can be seen from figure 3 , it is separated from the crown 1 by a belt 7 or round and it ends in a sharp pointed colette 8.
  • facets of the breech 6 there are four facets which, in this memoir, are called peak facets 9, 10, 11 and 12. These facets extend between the acute colette 8, in this particular case since colette itself, to a location 13, 14, 15 and 16 which is intermediate between the colette 8 and the belt 7. In other words, these tip facets do not extend to the waist, as this is the case of breech facets of cut diamonds in the usual way.
  • the other facets of the breech will be called the breeches of breech 17. It may also be noted that, in the example illustrated, the point facet 9 is longer than the other tip facets 10 to 12 and that together they form a cross with asymmetrical branches. Finally we can also note that for each facet tip, a tip facet, located opposite to the colette, was cut.
  • the diamond is arranged with the crown upwards and the table is in horizontal position. It is in fact installed in an observation device according to the prior art, and it receives an incident light whose rays 18 have in this example an angle ⁇ of about 98 ° with respect to the horizontal, that is to say with respect to the plane of the table 2.
  • This light passes through a bezel 4, being slightly deviated.
  • the bezel has, relative to the horizontal, for example an angle ⁇ between 25 and 80 °, in particular from 33 to 37 °.
  • the tip facets 10 and 12 have been cut so as to have, with respect to the horizontal, an angle ⁇ of between 25 and 52 °, advantageously between 36 and 41 °, preferably between 40 and 41 °.
  • angles are to be adapted according to the refractive indices typical of the different stones.
  • the light beam 18, deflected by the bezel 4 is reflected on the tip facet 12 in the direction the opposite point facet 10 where it is reflected vertically again, with projection through the table 2 of the crown, that is to say perpendicular to it.
  • the intermediate location 16 of the point facet 12 has been chosen so that an incident ray which strikes it is also, after double reflection, projected through the table 2. This avoids a projection of the image. any portion of the tip facets through the crown facets and avoid some loss of gloss.
  • the observable image in the observation device is clear, without optical deformation of the "arrow" type.
  • the center of the diamond which is designated by the reference O on the figure 4 .
  • the location of the first reflection of the incident ray on the tip facet 12 is designated by the reference A.
  • the projection of A on a horizontal plane passing through O gives a point A '.
  • the location of the second reflection of the light beam on the opposite point facet 10 is designated by the reference B and the projection thereof on the horizontal plane passing through O is designated by the reference B '.
  • the distance OA ' is greater than the distance OB', which means that the image displayed in the observation device is smaller than the reality.
  • tip facets 9 to 12 are shown in a view from below. In hatched is shown the image that can be seen when looking at the diamond from above in the observation device. We notice that the image is reversed.
  • the lengths of the tip facets 9 and 11 have been measured so that a total reflection of the larger tip facet 9 is possible on the tip facet 10, although it is smaller in size. This is possible given the reduction of the dimensions of the image during the reflections, as explained above.
  • FIGS 6 and 7 represent an alternative embodiment of ashlar according to the invention, in which the facets as well of crown than of cylinder head have received different shapes from those obtained in stone according to the Figures 1 and 2 .
  • the point facets 9 to 12 extend here also between the colette 8 and an intermediate location between the colette and the belt 7. They are arranged symmetrically with respect to the colette and extend over the same length, presenting each an elongated irregular shape of hexagon.
  • tip facets having other shapes and arranged not only cross but also for example in a rosette or so as to form a polygon around the acute colette.

Landscapes

  • Adornments (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

The invention concerns a precious, semi-precious or mineral cut stone, comprising a crown ( 1 ) including in its center a planar table ( 2 ) surrounded with several facets of the crown ( 3 - 5 ), a pavilion ( 6 ) comprising a pointed culet ( 8 ) and several pavilion facets ( 9 - 12 and 17 ), and between the crown ( 1 ) and the pavilion ( 6 ), a girdle ( 7 ). The invention is characterized in that said pavilion facets comprise at least one top facet ( 9 - 12 ) extending between said pointed culet ( 8 ) and an intermediate location ( 13 - 16 ) between the girdle ( 7 ) and the culet ( 8 ).

Description

La présente invention est relative à une pierre de taille précieuse, semi-précieuse ou minérale, comportant

  • une couronne comprenant en son centre une table plane entourée de plusieurs facettes de couronne,
  • une culasse comprenant une colette aiguë et plusieurs facettes de culasse, et
  • entre la couronne et la culasse, une ceinture.
The present invention relates to a precious stone, semi-precious or mineral, comprising
  • a crown comprising at its center a flat table surrounded by a plurality of crown facets,
  • a breech comprising an acute colette and a plurality of breech facets, and
  • between the crown and the breech, a belt.

De telles pierres de taille sont bien connues (voir par example le document US-A-2004/083759 ). On peut par exemple faire référence aux diamants, en particulier ceux taillés en brillant, notamment selon la taille appelée Round Brillant Cut.Such cut stones are well known (see for example the document US-2004/083759 ). One can for example refer to diamonds, especially those cut in brilliant, especially according to the size called Round Brillant Cut.

On connaît aussi des dispositifs d'observation de pierres qui permettent de visualiser une image par réflexion de lumière à travers le diamant dans des conditions d'éclairage particulières (voir par exemple JP 6174648 ).Stone observation devices are also known which make it possible to visualize an image by reflection of light through the diamond under particular lighting conditions (see, for example, JP 6174648 ).

Lors de l'observation dans un tel dispositif d'un diamant côté couronne vers le haut, on peut observer le phénomène appelé "arrow", c'est-à-dire qu'on observe une projection réfléchie et déformée de la disposition des facettes de culasse. Dans un diamant traité selon une taille Round Brillant Cut on observera 8 "arrows". Si on augmente la nombre de facettes de culasse, on pourra observer 10 "arrows" (voir par exemple JP 2004299370 ). Ce type de modification de taille n'évite cependant pas une déformation de l'image projetée au travers de la couronne après réflexion de lumière sur les facettes de culasse du diamant.When observing such a device with a crown-side diamond upwards, the phenomenon known as "arrow" can be observed, that is to say a reflected and distorted projection of the arrangement of the facets is observed. breech. In a diamond treated to a Round Brillant Cut size, 8 "arrows" will be observed. If we increase the number of veneers, we can observe 10 "arrows" (see for example JP 2004299370 ). This type of size modification does not, however, prevent deformation of the projected image through the crown after reflection of light on the diamond head facets.

La présente invention a pour but de mettre au point une pierre taillée ne présentant pas cet inconvénient et permettant donc une observation d'une image non déformée dans un dispositif d'observation conforme à l'état de la technique précité. Avantageusement, la pierre ainsi taillée présentera une brillance améliorée et, selon sa taille, elle permettra la projection d'images nettes, différentes et originales.The present invention aims to develop a cut stone does not have this disadvantage and thus allowing an observation of an undeformed image in an observation device according to the prior art. Advantageously, the stone thus cut will have an improved gloss and, depending on its size, it will allow the projection of sharp images, different and original.

Pour résoudre ces problèmes, on a prévu une pierre de taille telle qu'indiquée au début, dans laquelle lesdites facettes de culasse comprennent au moins une facette de pointe qui s'étend entre ladite colette aiguë et un emplacement intermédiaire entre la ceinture et la colette. De préférence ladite facette de pointe s'étend depuis ladite colette aiguë jusqu'audit emplacement intermédiaire. Les facettes de pointe ne s'étendent donc pas jusqu'à la ceinture. Il devient dès lors possible de les agencer de façon à pouvoir observer leur image dans le dispositif d'observation selon l'état de la technique précité, sans déformation, car elle peut ne plus être réfléchie à travers des facettes de la couronne, comme c'est le cas actuellement avec les diamants taillés de manière usuelle.To solve these problems, there is provided a stone as indicated at the beginning, wherein said breech facets comprise at least one tip facet which extends between said acute colette and an intermediate location between the belt and the colette . Preferably said tip facet extends from said acute colette to said intermediate location. The tip facets do not extend to the waist. It therefore becomes possible to arrange them so as to be able to observe their image in the observation device according to the state of the art, without deformation, because it can no longer be reflected through facets of the crown, as in FIG. is currently the case with diamonds cut in the usual way.

Il devient ainsi possible de conférer à la pierre une image représentant une forme ou un symbole sélectionné par la taille des facettes de pointe. On peut dès lors caractériser les pierres d'une production, en leur attribuant un symbole original correspondant par exemple à un label de qualité ou d'origine d'une manière non visible, lors de l'usage normal de la pierre, c'est-à-dire par exemple sous la forme d'un bijou monté.It thus becomes possible to give the stone an image representing a shape or a symbol selected by the size of the tip facets. We can then characterize the stones of a production, by attributing to them an original symbol corresponding for example to a label of quality or origin in a non visible way, during the normal use of the stone, it is ie for example in the form of a mounted jewel.

Suivant une forme perfectionnée de l'invention, une facette de pointe est, par rapport à ladite colette, située à l'opposé de chaque facette de pointe susdite, de façon qu'une lumière projetée au travers de ladite couronne sous un angle prédéterminé par rapport à la table subisse une première réflexion sur une facette de pointe avec projection d'une image de celle-ci vers ladite facette de pointe opposée où la lumière subit une deuxième réflexion avec projection de ladite image au travers de la couronne, et ledit emplacement intermédiaire de chaque facette de pointe est disposé entre la ceinture et la colette de telle façon que l'image de chaque facette de pointe issue de ladite deuxième réflexion soit totalement projetée perpendiculairement au travers de la table plane de la couronne. Dans cet agencement, l'image réfléchie des facettes de pointe de la culasse est projetée au travers de la table de la couronne, qui est tout à fait plane et perpendiculaire aux rayons réfléchis, ce qui n'occasionne donc aucune déformation optique.According to an improved form of the invention, a tip facet is, with respect to said colette, located opposite each said tip facet, so that a light projected through said crown at an angle predetermined by relation to the table undergoes a first reflection on a tip facet with projection of an image thereof to said opposite tip facet where the light undergoes a second reflection with projection of said image through the crown, and said intermediate location of each tip facet is disposed between the belt and colette so that the image of each peak facet from said second reflection is totally projected perpendicularly through the flat table of the crown. In this arrangement, the reflected image of the tip facets of the yoke is projected through the crown table, which is quite flat and perpendicular to the reflected rays, thus causing no optical deformation.

Suivant une forme avantageuse de l'invention, ladite au moins une facette de pointe s'étend sous un angle de 25 à 52°, de préférence de 36 à 41°, par rapport à la table. Par exemple, lorsque la lumière passant par le dispositif d'observation selon l'état connu de la technique précité est projetée sous un angle prédéterminé susdit de l'ordre de 98° par rapport à la table, des facettes de couronne sont disposées sous un angle de 25 à 80°, de préférence de 33 à 37° par rapport à la table et lesdites facettes de pointe s'étendent sous un angle de 40 à 41° par rapport à la table.According to an advantageous form of the invention, said at least one tip facet extends at an angle of 25 to 52 °, preferably 36 to 41 °, with respect to the table. For example, when the light passing through the observation device according to the known state of the aforementioned technique is projected at a predetermined angle of the order of 98 ° relative to the table, crown facets are arranged under a angle of 25 to 80 °, preferably 33 to 37 ° relative to the table and said tip facets extend at an angle of 40 to 41 ° with respect to the table.

Dans ces conditions, la réflexion de lumière incidente est maximale ce qui permet d'améliorer nettement la brillance de la pierre.Under these conditions, the incident light reflection is maximum which significantly improves the brilliance of the stone.

La présente invention concerne également un procédé de taille de pierre comprenant un facettage d'une couronne présentant en son centre une table plane entourée de facettes de couronne, un facettage d'une culasse présentant une colette aiguë et plusieurs facettes de culasse et une formation d'une ceinture entre la couronne et la culasse. Ce procédé est caractérisé en ce qu'il comprend une taille d'au moins une facette de culasse sous la forme d'une facette de pointe qui s'étend de la colette aiguë à un emplacement intermédiaire entre la ceinture et la colette.The present invention also relates to a stone cutting method comprising a crown facetting having at its center a flat table surrounded by crown facets, a facetting of a cylinder head having an acute colette and a plurality of cylinder head facets and a formation of a belt between the crown and the cylinder head. This method is characterized in that it comprises a size of at least one breech facet in the form of a tip facet which extends from the acute colette to an intermediate location between the belt and the colette.

D'autres formes de réalisation de la pierre de taille suivant l'invention et de son procédé de taille sont indiquées dans les revendications annexées.Other embodiments of the ashlar according to the invention and its method of size are indicated in the appended claims.

D'autres détails et particularités de l'invention ressortiront de la description de pierres de taille, donnée ci-après à titre non limitatif, et avec référence aux dessins annexés.

  • La figure 1 représente une vue en plan du dessus de la couronne d'un diamant suivant l'invention.
  • La figure 2 représente une vue en plan du dessous de la culasse du diamant de la figure 1.
  • La figure 3 représente une vue latérale du diamant de la figure 2, suivant les flèches III-III.
  • La figure 4 représente une vue en section, suivant la ligne IV-IV, du diamant de la figure 2.
  • La figure 5 représente une vue des facettes de pointe de la culasse du diamant représenté sur les figures 1 à 3.
  • Les figures 6 et 7 sont des vues, semblables aux figures 1 et 2, d'un autre diamant suivant l'invention.
Other details and particularities of the invention will emerge from the description of cut stones, given hereinafter without limitation, and with reference to the appended drawings.
  • The figure 1 represents a top plan view of the crown of a diamond according to the invention.
  • The figure 2 represents a plan view from below the diamond head of the figure 1 .
  • The figure 3 represents a side view of the diamond from the figure 2 , following the arrows III-III.
  • The figure 4 represents a sectional view along the line IV-IV of the diamond of the figure 2 .
  • The figure 5 represents a view of the tip facets of the diamond head shown in Figures 1 to 3 .
  • The Figures 6 and 7 are views, similar to Figures 1 and 2 of another diamond according to the invention.

Sur les différentes figures, les éléments identiques ou analogues sont désignés par les mêmes références.In the various figures, identical or similar elements are designated by the same references.

La description qui suit est relative à des diamants taillés. Il faut entendre que la présente invention concerne aussi d'autres pierres de taille, par exemple des rubis, des émeraudes, etc.The following description relates to cut diamonds. It should be understood that the present invention also relates to other cut stones, for example rubies, emeralds, etc.

Ainsi qu'il ressort de la figure 1, le diamant illustré comporte une couronne 1 comprenant en son centre une table plane 2 entourée de plusieurs facettes de couronne. Ces facettes de couronne sont, de la manière usuelle, constituées de huit étoiles 3, de huit bézels 4 et de seize haléfis de couronne 5.As is apparent from the figure 1 , the illustrated diamond comprises a crown 1 comprising in its center a flat table 2 surrounded by several facets of crown. These crown facets are, in the usual way, consisting of eight stars 3, eight bezels 4 and sixteen ring halves 5.

Sur la figure 2, on a illustré la culasse 6. Ainsi qu'il ressort de la figure 3, celle-ci est séparée de la couronne 1 par une ceinture 7 ou rondiste et elle se termine en pointe en une colette aiguë 8.On the figure 2 , breech 6 has been illustrated. As can be seen from figure 3 , it is separated from the crown 1 by a belt 7 or round and it ends in a sharp pointed colette 8.

Parmi les facettes de la culasse 6, on distingue quatre facettes qui, dans le présent mémoire, sont appelées facettes de pointe 9, 10, 11 et 12. Ces facettes s'étendent entre la colette aiguë 8, dans ce cas particulier depuis la colette elle-même, jusqu'à un emplacement 13, 14, 15 et 16 qui est intermédiaire entre la colette 8 et la ceinture 7. En d'autres mots, ces facettes de pointe ne s'étendent pas jusqu'à la ceinture, comme c'est le cas des facettes de culasse des diamants taillés de manière usuelle. Les autres facettes de la culasse seront appelées les haléfis de culasse 17. On peut aussi noter que, dans l'exemple illustré, la facette de pointe 9 est plus longue que les autres facettes de pointe 10 à 12 et qu'ensemble elles forment une croix à branches dissymétriques. Enfin on peut aussi remarquer que, pour chaque facette pointe, une facette de pointe, située à l'opposé par rapport à la colette, a été taillée.Among the facets of the breech 6, there are four facets which, in this memoir, are called peak facets 9, 10, 11 and 12. These facets extend between the acute colette 8, in this particular case since colette itself, to a location 13, 14, 15 and 16 which is intermediate between the colette 8 and the belt 7. In other words, these tip facets do not extend to the waist, as this is the case of breech facets of cut diamonds in the usual way. The other facets of the breech will be called the breeches of breech 17. It may also be noted that, in the example illustrated, the point facet 9 is longer than the other tip facets 10 to 12 and that together they form a cross with asymmetrical branches. Finally we can also note that for each facet tip, a tip facet, located opposite to the colette, was cut.

Sur la figure 4, le diamant est disposé avec la couronne vers le haut et la table est en position horizontale. Il est en fait installé dans un dispositif d'observation selon l'état antérieur de la technique précité, et il reçoit une lumière incidente dont les rayons 18 présentent dans cet exemple un angle α d'environ 98° par rapport à l'horizontale, c'est-à-dire par rapport au plan de la table 2. Cette lumière passe au travers d'un bézel 4, en étant légèrement déviée. Le bézel présente, par rapport à l'horizontale, par exemple un angle β compris entre 25 et 80°, en particulier de 33 à 37°.On the figure 4 , the diamond is arranged with the crown upwards and the table is in horizontal position. It is in fact installed in an observation device according to the prior art, and it receives an incident light whose rays 18 have in this example an angle α of about 98 ° with respect to the horizontal, that is to say with respect to the plane of the table 2. This light passes through a bezel 4, being slightly deviated. The bezel has, relative to the horizontal, for example an angle β between 25 and 80 °, in particular from 33 to 37 °.

Dans cet exemple illustré sur la figure 4, les facettes de pointe 10 et 12 ont été taillées de manière à présenter, par rapport à l'horizontale, un angle γ compris entre 25 et 52°, avantageusement entre 36 et 41°, de préférence entre 40 et 41 °.In this example shown on the figure 4 , the tip facets 10 and 12 have been cut so as to have, with respect to the horizontal, an angle γ of between 25 and 52 °, advantageously between 36 and 41 °, preferably between 40 and 41 °.

Il faut noter que les angles sont à adapter en fonction des indices de réfraction typiques des différentes pierres.It should be noted that the angles are to be adapted according to the refractive indices typical of the different stones.

Ainsi qu'il est illustré sur la figure 5, le rayon lumineux 18, dévié par le bézel 4, est réfléchi sur la facette de pointe 12 en direction de la facette de pointe opposée 10 où il est réfléchi à nouveau, verticalement, avec projection à travers la table 2 de la couronne, c'est-à-dire perpendiculairement à celle-ci. L'emplacement intermédiaire 16 de la facette de pointe 12 a donc été choisi de façon qu'un rayon incident qui le frappe soit, lui aussi, après double réflexion, projeté à travers la table 2. On évite ainsi une projection de l'image d'une quelconque partie des facettes de pointe à travers les facettes de couronne et on évite une certaine perte de brillance. L'image observable dans le dispositif d'observation est nette, sans déformation optique du type "arrow".As illustrated on the figure 5 the light beam 18, deflected by the bezel 4, is reflected on the tip facet 12 in the direction the opposite point facet 10 where it is reflected vertically again, with projection through the table 2 of the crown, that is to say perpendicular to it. The intermediate location 16 of the point facet 12 has been chosen so that an incident ray which strikes it is also, after double reflection, projected through the table 2. This avoids a projection of the image. any portion of the tip facets through the crown facets and avoid some loss of gloss. The observable image in the observation device is clear, without optical deformation of the "arrow" type.

A l'emplacement de la colette, se trouve le centre du diamant qui est désigné par la référence O sur la figure 4. L'emplacement de la première réflexion du rayon incident sur la facette de pointe 12 est désigné par la référence A. La projection de A sur un plan horizontal passant par O donne un point A'. L'emplacement de la deuxième réflexion du rayon lumineux sur la facette de pointe opposée 10 est désigné par la référence B et la projection de celui-ci sur le plan horizontal passant par O est désignée par la référence B'. Comme on peut le constater sur la figure 4, la distance OA' est supérieure à la distance OB', ce qui signifie que l'image visualisée dans le dispositif d'observation est plus petite que la réalité.At the location of the colette, is the center of the diamond which is designated by the reference O on the figure 4 . The location of the first reflection of the incident ray on the tip facet 12 is designated by the reference A. The projection of A on a horizontal plane passing through O gives a point A '. The location of the second reflection of the light beam on the opposite point facet 10 is designated by the reference B and the projection thereof on the horizontal plane passing through O is designated by the reference B '. As can be seen from the figure 4 , the distance OA 'is greater than the distance OB', which means that the image displayed in the observation device is smaller than the reality.

Sur la figure 5, on a illustré uniquement les facettes de pointe 9 à 12 dans une vue du dessous. En hachuré on a représenté l'image que l'on peut voir lorsqu'on regarde le diamant du dessus dans le dispositif d'observation. On remarque que l'image est renversée. Les longueurs des facettes de pointe 9 et 11 ont été mesurées de façon qu'une réflexion totale de la facette de pointe plus grande 9 soit possible sur la facette de pointe 10, bien qu'elle soit de plus petite dimension. Cela s'avère possible étant donné la réduction des dimensions de l'image au cours des réflexions, comme expliqué précédemment.On the figure 5 only the tip facets 9 to 12 are shown in a view from below. In hatched is shown the image that can be seen when looking at the diamond from above in the observation device. We notice that the image is reversed. The lengths of the tip facets 9 and 11 have been measured so that a total reflection of the larger tip facet 9 is possible on the tip facet 10, although it is smaller in size. This is possible given the reduction of the dimensions of the image during the reflections, as explained above.

Les figures 6 et 7 représentent une variante de réalisation de pierre de taille suivant l'invention, dans laquelle les facettes aussi bien de couronne que de culasse ont reçu des formes différentes de celles obtenues dans la pierre selon les figures 1 et 2.The Figures 6 and 7 represent an alternative embodiment of ashlar according to the invention, in which the facets as well of crown than of cylinder head have received different shapes from those obtained in stone according to the Figures 1 and 2 .

Les facettes de pointe 9 à 12 s'étendent ici aussi entre la colette 8 et un emplacement intermédiaire entre la colette et la ceinture 7. Elles sont disposées de manière symétrique par rapport à la colette et s'étendent sur une même longueur, en présentant chacune une forme d'hexagone irrégulier, allongé.The point facets 9 to 12 extend here also between the colette 8 and an intermediate location between the colette and the belt 7. They are arranged symmetrically with respect to the colette and extend over the same length, presenting each an elongated irregular shape of hexagon.

Sur la figure 7, on a représenté en hachuré, comme sur la figure 5, l'image que l'on pourrait observer en disposant cette pierre, côté couronne vers le haut, dans un dispositif d'observation selon l'état antérieur de la technique précité.On the figure 7 , it is shown hatched, as on the figure 5 , the image that could be observed by placing this stone, crown side upwards, in an observation device according to the prior state of the aforementioned technique.

Il doit être entendu que la présente invention n'est en aucune façon limitée aux formes de réalisation décrites ci-dessus et que bien des modifications pourraient y être apportées sans sortir du cadre des revendications qui suivent.It should be understood that the present invention is in no way limited to the embodiments described above and that many modifications could be made without departing from the scope of the following claims.

On pourrait par exemple imaginer des facettes de pointe ayant d'autres formes et disposées non seulement en croix mais aussi par exemple en rosette ou de manière à former un polygone autour de la colette aiguë.One could for example imagine tip facets having other shapes and arranged not only cross but also for example in a rosette or so as to form a polygon around the acute colette.

Claims (11)

  1. Precious, semi-precious or mineral cut stone, comprising
    - a crown (1) comprising at its centre a planar table (2) surrounded by several crown facets (3-5),
    - a pavilion (6) comprising a pointed culet (8) and several pavilion facets (9-12 and 17), and
    - between the crown (1) and the pavilion (6), a girdle (7),
    characterised in that the said pavilion facets comprise at least one point facet (9-12) that extends between the said pointed culet (8) and an intermediate location (13-16) between the girdle (7) and the culet (8).
  2. Stone according to claim 1, characterised in that a point facet (9-12) is, with respect to the said culet (8), situated opposite each aforementioned point facet, so that light (18) projected through the said crown (1) at a predetermined angle (α) with respect to a perpendicular to the table (2) undergoes a first reflection on a point facet (12) with projection of an image thereof towards the said opposite point facet (10) where the light undergoes a second reflection with projection of the said image through the crown, and in that the said intermediate location (13-16) of each point facet is disposed between the girdle (7) and the culet (8) so that the image of each point facet issuing from the said second reflection is totally projected through the planar table (2) of the crown.
  3. Stone according to one or other of claims 1 and 2, characterised in that the said at least one point facet (9-12) extends at an angle of 25° to 52° with respect to the table (2).
  4. Stone according to one or other of claims 2 and 3, characterised in that crown facets are disposed at an angle of 25° to 80° with respect to the table, the said point facets extending at an angle of 36° to 41° with respect to the table.
  5. Stone according to any one of claims 1 to 4, characterised in that it comprises several aforementioned point facets disposed in a cross, in a bow or in a polygonal shape around the pointed culet.
  6. Stone according to claim 5, characterised in that the point facets are disposed symmetrically with respect to the pointed culet.
  7. Stone according to claim 5, characterised in that the point facets are disposed asymmetrically with respect to the pointed culet.
  8. Stone cutting method comprising a faceting of a crown having at its centre a planar table surrounded by crown facets, a faceting of a pavilion having a pointed culet and several pavilion facets and formation of a girdle between the crown and the pavilion, characterised in that it comprises a cutting of at least one pavilion facet in the form of a point facet that extends from the pointed culet to an intermediate location between the girdle and the culet.
  9. Method according to claim 8, characterised in that it comprises a cutting of a point facet which, with respect to the said culet, is situated opposite each aforementioned point facet.
  10. Method according to one of claims 8 and 9, characterised in that the cutting of each point facet is carried out at an angle of 25° to 52° with respect to the table.
  11. Method according to claim 10, characterised in that the faceting of the crown comprises a formation of crown facets at an angle of 25° to 80° with respect to the table and in that the cutting of each point facet is carried out at an angle of 36° to 41° with respect to the table.
EP06741306A 2005-05-25 2006-05-19 Precious, semi-precious or mineral cut stone and method for cutting same Not-in-force EP1895868B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2005/0259A BE1016601A3 (en) 2005-05-25 2005-05-25 Process for size and precious stone, semi-precious mineral and obtained for the method.
PCT/BE2006/000055 WO2006125281A1 (en) 2005-05-25 2006-05-19 Precious, semi-precious or mineral cut stone and method for cutting same

Publications (2)

Publication Number Publication Date
EP1895868A1 EP1895868A1 (en) 2008-03-12
EP1895868B1 true EP1895868B1 (en) 2008-12-17

Family

ID=36972909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06741306A Not-in-force EP1895868B1 (en) 2005-05-25 2006-05-19 Precious, semi-precious or mineral cut stone and method for cutting same

Country Status (8)

Country Link
US (1) US20080190139A1 (en)
EP (1) EP1895868B1 (en)
JP (1) JP2008541800A (en)
CN (1) CN101179960A (en)
AT (1) ATE417522T1 (en)
BE (1) BE1016601A3 (en)
DE (1) DE602006004341D1 (en)
WO (1) WO2006125281A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8844319B2 (en) * 2011-01-14 2014-09-30 Jonathan WEINGARTEN Cut gemstone providing a specific optical pattern
JP5788562B1 (en) * 2014-05-01 2015-09-30 株式会社タスコ jewelry
CN104738921B (en) * 2015-01-07 2016-06-29 深圳市国嘉珠宝有限公司 A kind of processing technique of phantom gold or karat gold jewelry
CN108851394B (en) * 2017-05-12 2023-08-25 深圳鸳鸯金楼珠宝股份有限公司 Diamond and pavilion processing method thereof, arrow diamond and pavilion structure thereof
CN108851393B (en) * 2017-05-12 2023-08-18 深圳鸳鸯金楼珠宝股份有限公司 Diamond and pavilion processing method thereof, frosted diamond and pavilion structure thereof
EP3537225B1 (en) * 2018-03-06 2020-10-28 Nivarox-FAR S.A. Method for manufacturing diamond polished marks for a timepiece
US20190350322A1 (en) * 2018-05-15 2019-11-21 Healing Cross LLC Gemstone facet image illumination
WO2020008454A1 (en) * 2018-07-02 2020-01-09 AVLAS, Menahem Cross-oriented method for cutting and polishing gemstones

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US693084A (en) * 1901-04-04 1902-02-11 David C Townsend Diamond.
US712155A (en) * 1902-04-02 1902-10-28 William D Seddon Diamond-cutting.
US1131593A (en) * 1914-05-05 1915-03-09 Ulla O Bashor Gem-setting.
US1392604A (en) * 1919-08-22 1921-10-04 Charles G Smith Jewelry
US2265316A (en) * 1940-10-12 1941-12-09 Ernest G H Schenck Cut stone
US3286486A (en) * 1964-01-10 1966-11-22 Huisman James Diamond with specially faceted pavilion
BE868383A (en) * 1978-06-22 1978-10-16 Okuda Kazumi MOLYBDENE PATTERN DIAMOND LINKED TO THIS
USD262200S (en) * 1979-11-23 1981-12-08 Gemcross, Inc. Gem with cross crown
US5072549A (en) * 1986-09-22 1991-12-17 Harold Johnston Method of cutting gemstones and product
JPH0378636U (en) * 1989-12-04 1991-08-09
US6615611B1 (en) * 2000-09-26 2003-09-09 Michael Schachter High yield diamond
US6997014B2 (en) * 2002-11-04 2006-02-14 Azotic Coating Technology, Inc. Coatings for gemstones and other decorative objects
USD499983S1 (en) * 2003-10-28 2004-12-21 Kristall Classics, Inc. Faceted gemstone
USD514015S1 (en) * 2004-11-02 2006-01-31 Nelson Jewellery Arts Company Ltd. Almond shaped diamond
USD569757S1 (en) * 2006-06-16 2008-05-27 Abel Arlan R Gemstone
USD574288S1 (en) * 2007-02-26 2008-08-05 Peled Diamonds, Ltd. Precious stone

Also Published As

Publication number Publication date
ATE417522T1 (en) 2009-01-15
WO2006125281A1 (en) 2006-11-30
US20080190139A1 (en) 2008-08-14
DE602006004341D1 (en) 2009-01-29
CN101179960A (en) 2008-05-14
EP1895868A1 (en) 2008-03-12
BE1016601A3 (en) 2007-02-06
JP2008541800A (en) 2008-11-27

Similar Documents

Publication Publication Date Title
EP1895868B1 (en) Precious, semi-precious or mineral cut stone and method for cutting same
EP1110472B1 (en) Cut gemstone, especially cut diamond
EP2271232B1 (en) Decorative portable object
EP3250075B1 (en) Movable decorative elements
EP1689261B1 (en) Invisible setting of precious stones
CH704707B1 (en) Oscillating weight for automatic watch.
EP3378346A1 (en) Stone and method for manufacturing same
WO2016083680A1 (en) Cut gem and article comprising such a gem
EP0311487A1 (en) Gem mounting especially for a diamant, setting for such a gem and gem mounting, process and tool for making such a mounting
DE10204911A1 (en) Jewel with stone
CA2271736C (en) Decorative stone
EP2407832A1 (en) Timepiece movement
EP2326197B1 (en) Openable ring
EP2896312A1 (en) Piece of jewellery with articulated links, in particular a watch strap, and method for manufacturing same
EP0082119A1 (en) Watch case body and method to manufacture the same
CH704684B1 (en) Watch comprising juxtaposed optical fibers.
EP3991592A1 (en) Cut stone for a piece of costume jewellery, jewellery or a timepiece
CH718004B1 (en) Watch flange, wristwatch flange and method of manufacturing a watch flange.
WO2001070068A1 (en) Ornamental piece with removable part
EP3226713B1 (en) Jewellery stone, in particular facetted diamond and method for mounting same on a mount
EP3045069A1 (en) Cut stone and support comprising such a cut stone
WO2018083388A1 (en) Jewellery
EP3865953A1 (en) Oscillating winding mass provided with a rotary decorative element for automatic movement of a timepiece
CH719956A2 (en) Interchangeable mobile decorative device and piece of jewelry comprising such a device.
EP0925737A1 (en) Jewel made of links and method for manufacturing the same

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20071212

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

DAX Request for extension of the european patent (deleted)
GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REF Corresponds to:

Ref document number: 602006004341

Country of ref document: DE

Date of ref document: 20090129

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090317

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090328

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090518

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090417

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090317

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

26N No opposition filed

Effective date: 20090918

BERE Be: lapsed

Owner name: SATO, TAKEHIKO

Effective date: 20090531

Owner name: KOGANEI, MISUZU

Effective date: 20090531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090531

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20100129

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090602

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091201

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090318

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100519

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090519

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090618

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100519

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081217