EP1110472A1 - Cut gemstone, especially cut diamond - Google Patents

Cut gemstone, especially cut diamond Download PDF

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Publication number
EP1110472A1
EP1110472A1 EP00125864A EP00125864A EP1110472A1 EP 1110472 A1 EP1110472 A1 EP 1110472A1 EP 00125864 A EP00125864 A EP 00125864A EP 00125864 A EP00125864 A EP 00125864A EP 1110472 A1 EP1110472 A1 EP 1110472A1
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EP
European Patent Office
Prior art keywords
facets
rondist
gem
cut
crown
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Granted
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EP00125864A
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German (de)
French (fr)
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EP1110472B1 (en
Inventor
Eve Zimet
Nadine Schmidt
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Montblanc Simplo GmbH
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Montblanc Simplo GmbH
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    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C17/00—Gems or the like
    • A44C17/001—Faceting gems

Definitions

  • the present invention relates to a cut gem comprising a first predetermined number of facets cut in the crown and a second number predetermined facets cut in the cylinder head around an axis of symmetry central geometric.
  • the gem in particular the cut diamond, points to the observer an image with a general hexagonal symmetry and a set of light reflections and six-pointed star differential colorings where the lobes send shimmering optical effects to the observer.
  • the gem consists of diamond or stone with a refractive index and a dispersion roughly equal to those of diamond.
  • optical effects of light effects are obtained particularly important.
  • said central geometric axis of symmetry corresponds to one of the axes of ternary crystallographic symmetry of the diamond.
  • This feature makes it easier and safer to size the table. by cleavage of the diamond along one of the faces of the octahedron.
  • the quality of the size of the facets can thus be predetermined and be carried out with great precision.
  • the invention also relates to a method for cutting a gem, by peculiar to a diamond characterized by the fact that we first cut all the facets of the crown and the cylinder head and that we then cut the lobed perimeter of the rondist by performing the lobed form with six portions in rounded projection and six rounded hollow portions.
  • Figures 1, 2 and 3 are top, bottom and side views of a first mode of execution.
  • FIG. 4 represents certain characteristics of the external contour of the first mode executioner.
  • Figures 5, 6 and 7 are top, bottom and side views of a second mode of execution.
  • the cut gem shown in Figures 1 to 3 is a diamond and includes a crown 10 and a cylinder head 11 separated by a rondist 12.
  • the shape geometric cut of this diamond has a hexagonal symmetry with in as a main element of symmetry a hexagonal axis of rotation 14. The facets of the size are therefore arranged around this axis according to an arrangement hexagonal.
  • This axis of geometric symmetry preferably corresponds to one of the axes ternary crystallographic of the crystal structure of the diamond, if the shape geometric of the rough diamond to be cut allows it.
  • Table 16 and the plan of the rondist 12 will therefore be parallel to one of the facets of the diamond octahedron gross, which will make it possible to obtain the location of table 16 by cleavage of the rough diamond, avoiding tedious sawing as is generally the case necessary when the table is perpendicular to one of the crystallographic axes of order four of the diamond.
  • the contour 20 of the rondist 12 seen perpendicular to the hexagonal axis 14, as illustrated in FIG. 4, has a lobed shape with six projecting portions rounded 21 and six rounded hollow portions 22.
  • the rondist 12 has a maximum outside diameter D, a minimum inside diameter Di and a diameter medium Dm intermediate.
  • the projecting portions 21 have a radius of curvature r2 which is substantially equal to 0.125 D, while the radius of curvature r3 of recessed portions 22 is substantially equal to 0.062 D.
  • the crown 10 includes a table 16 with a hexagonal outline or substantially hexagonal depending on the size precision.
  • First six facets triangular 25 each share one of their edges with an edge of the table.
  • Six second facets 26 are inserted between the first facets and six third facets 27 share one of their edges with a second edge facets 26 and make the connection with the rondist 12.
  • the cylinder head 11 has six fourth facets 28 and twelve fifths facets 29 arranged near the rondiste on either side of the edges separating the fourth facets, and six sixth facets 30 arranged near the base 31 partially between two neighboring fourth facets 28.
  • the second, third and fourth facets 26, 27, 28, as well as the recessed portions 22 of the rondist are arranged in a first position identical angular around the hexagonal geometric axis, while the first and sixth facets 25, 30 and the projecting portions 21 are found in a second angular position offset by 30 ° from the first angular position. There is therefore a predetermined correspondence between the facets of the crown, those of the cylinder head and the outline of the rondiste.
  • the height H of the gem cut between its table and its base is preferably between 0.55 and 0.75 D, advantageously 0.6 D.
  • the height Ht of the crown above the plane of the rondist is preferably 0.13 D, and the height Hc of the cylinder head is preferably 0.47 D.
  • the first 25, respectively second 26, respectively third 27, respectively fourth 28 and sixth facet 30 respectively make angles included between 10 ° and 25 °, respectively 10 ° and 25 °, respectively 25 ° and 35 °, respectively 35 ° to 55 ° and respectively 25 ° to 35 °.
  • the third and fourth facets 27 and 28 on the one hand and on the other of the rondist make an angle of 30 ° and 42 ° with the plane of the rondist 12.
  • the method of cutting this gem firstly involves obtaining of the table, preferably by cleavage parallel to one of the faces of the octahedron and then, after the bruting, the size of the different facets of the crown and the breech.
  • This cut is made of preferably using a laser cutting device.
  • the surfaces of cutting of the rondiste 12 are then polished and cleaned until all traces of carbon black spots due to laser burns have missing.
  • the weight of the cut diamond retains approximately 25 to 30% of the weight of the cut diamond. rough diamond; this size therefore does not have a high yield.
  • diamonds cut according to this size allow to obtain total reflections internal with hexagonal and lobed image structure and shape, which gives the gem new and original optical effects.
  • This symmetry hexagonal combined with total internal reflections on the facets of the breech and a differential refraction on the facets of the crown allows obtain a remarkable and original fire due to its hexagonal distribution and peripheral lobes.
  • the second embodiment illustrated in Figures 5 to 7 also includes a crown 10 and a cylinder head 11 separated by a rondist 12.
  • the assembly also has a hexagonal geometric shape with an axis of symmetry hexagonal central 14 around which the facets are arranged in a hexagonal symmetry.
  • the axis of geometric symmetry can preferably also correspond to one of the ternary axes of symmetry of the structure diamond crystallography.
  • Rondiste 12 also has a lobed shape with six rounded projecting portions 21 and six rounded recessed portions 22, the radii of curvature can be similar to those of the first embodiment.
  • the crown 10 has here, instead of a table, an apex 50 formed by six first triangular facets 55 arranged in a first position angular around the hexagonal geometric axis 14.
  • Six second facets 56 are arranged in a middle position along a second angular position offset by 30 ° from the first angular position and six third facets arranged near the rondist according to the first angular position.
  • the breech 12 has twelve fourth facets 58 arranged near the rondist 12 and twelve fifth facets 59 forming the base 61 and arranged each between two fourth facets in an angular position offset by 15 ° compared to that of the fourth facets.
  • the recessed portions 22, the first and the third facets 55, 57 and half 58a of the fourth facets are arranged in the first position angular.
  • the projecting portions 21, the second facets 56 and the other half 58B fourth facets are arranged in the second angular position.
  • the height H between the apex 50 and the base 61 is between 0.5 and 0.75 times the outside diameter D of the rondist 12.
  • this height H, that Ht of the crown and that Hc of the cylinder head are 0.52 D, 0.18 D and 0.35 D.
  • the first 55, respectively second 56, respectively third 57, respectively fifth facets 59 do with the plane of the rondist of angles between 8 ° and 20 °, respectively 20 ° and 27 °, respectively 20 ° and 32 °, respectively 30 ° to 50 °.
  • second and fifth facets 56 and 59 on either side of the rondist make a 23 ° and 34 ° angle with the plane of the rondist 12.
  • the cutting process is similar in that the facets are first cut of the crown 10 and of the cylinder head 11 around the hexagonal axis 14, which preferably corresponds to the crystallographic ternary axis of the diamond, and that we then cut the lobed perimeter of the rondiste preferably with a laser.
  • the embodiments described above do not have no limiting nature and that they can receive any modifications desirable within the framework as defined by claim 1.
  • the cutting according to the invention can also be carried out on other stones and gems with similar refractive index and dispersion, or roughly equal to those of diamond. It may be necessary to adapt the angles of inclination of the facets taking into account the refractive indices of the substitute stones. Thus, the angles of the facets can also be changed according to the shape of the rough stones. Other additional facets can be added. These facets may only be as appropriate number of three per type of facets. The cutout of the rounder may also be obtained by any other suitable means.

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Abstract

The gemstone has a series of cut facets (16, 25, 26, 27) on its crown (10) and base, arranged in a hexagonal pattern about its axis of symmetry, while its shoulder (12) between the crown and base has a lobed edge (20) with a series of alternating rounded projections (21) and recesses (22). The crown has a hexagonal table (16) with at least six contiguous triangular primary facets (25) alternating with six secondary facets (26) which have six shoulder facets (27) adjoining their edges.

Description

La présente invention concerne une gemme taillée comprenant un premier nombre prédéterminé de facettes taillées dans la couronne et un second nombre prédéterminé de facettes taillées dans la culasse autour d'un axe de symétrie géométrique central.The present invention relates to a cut gem comprising a first predetermined number of facets cut in the crown and a second number predetermined facets cut in the cylinder head around an axis of symmetry central geometric.

Pendant bien des siècles, les gemmes furent taillées grossièrement, en cabochon ou en formes diverses souvent irrégulières, avec le seul souci de conserver à la gemme le plus gros volume possible. Ces pierres anciennes semblent souvent ternes et sans éclat, même lorsqu'elles possèdent un beau poli. Actuellement, la technique de taille a beaucoup évolué. La taille est exécutée scientifiquement en observant les lois de l'optique cristalline de façon à obtenir le meilleur rendement des qualités optiques propres aux gemmes transparentes. On cherche notamment à donner aux pierres un éclat maximum, ce qui est le cas lorsqu'elles renvoient à l'extérieur la plus grande partie de la lumière qu'elles reçoivent. D'autre part, le diamant présente une forte dispersion de l'indice de réfraction en fonction de la longueur d'onde de la lumière. Cette forte dispersion est à l'origine du feu que montre le diamant. Il est à noter qu'une lame à face parallèle ne peut montrer de feu, ni une pierre renvoyant la lumière blanche par simple réflexion sans que la lumière soit brisée par réfraction. Il n'y a feu que si la lumière est brisée par des réfractions et réflexions sur des facettes polies du diamant taillé. On a ainsi développé des tailles "Brillant" de plus en plus perfectionnées, telles que décrites par exemple dans le brevet CH 684.301 A5. Ces tailles "Brillant" présentent en général un axe de symétrie géométrique d'ordre quatre par la mise en place de facettes taillées parallèlement à la génératrice du cône qui les enveloppe en nombre de quatre ou de multiples de quatre, telles que les huit étoiles, les seize triangles de couronne et les seize triangles de culasse. Les diamants ainsi taillés renvoient vers l'observateur une image avec une symétrie d'ordre quatre.For many centuries, gems were roughly cut, in cabochon or in various forms often irregular, with the sole concern of keep the gem as large as possible. These ancient stones Often appear dull and dull, even when they have a nice polish. Currently, the pruning technique has evolved a lot. Pruning is performed scientifically by observing the laws of crystalline optics so as to obtain the better yield of the optical qualities specific to transparent gems. We seeks in particular to give the stones a maximum shine, which is the case when they return most of the light outside receive. On the other hand, the diamond has a strong dispersion of the index of refraction as a function of the wavelength of light. This strong dispersion is at the origin of the fire that the diamond shows. It should be noted that a blade facing parallel cannot show fire, nor a stone reflecting white light by simple reflection without the light being broken by refraction. There is fire only if the light is broken by refractions and reflections on polished facets of the cut diamond. We have therefore developed "Brilliant" sizes more and more improved, as described for example in patent CH 684,301 A5. These "Brillant" sizes generally have an axis of geometric symmetry of order four by placing facets cut parallel to the generator of the cone that wraps them in numbers of four or multiples of four, such as the eight stars, the sixteen crown triangles and the sixteen breech triangles. The diamonds thus cut return to the observer an image with a fourth order symmetry.

Il est le but de la présente invention de créer une nouvelle taille de gemme permettant d'obtenir des effets optiques originaux et une conception de forme différente, tout en conservant l'intensité de l'éclat et du feu des tailles "Brillant" connues. Ce but est atteint par les caractéristiques figurant dans la revendication 1.It is the object of the present invention to create a new gem size providing original optical effects and shape design different, while retaining the intensity of the shine and fire of the "Brillant" sizes known. This object is achieved by the features contained in the claim 1.

La gemme, en particulier le diamant ainsi taillé, renvoie vers l'observateur une image présentant une symétrie générale d'ordre hexagonale et un jeu de réflexions de lumière et de colorations différentielles étoilées à six branches où les lobes renvoient vers l'observateur des effets optiques chatoyants.The gem, in particular the cut diamond, points to the observer an image with a general hexagonal symmetry and a set of light reflections and six-pointed star differential colorings where the lobes send shimmering optical effects to the observer.

Selon un mode d'exécution préféré, la gemme est constituée par du diamant ou une pierre comportant un indice de réfraction et une dispersion sensiblement égaux à ceux du diamant.According to a preferred embodiment, the gem consists of diamond or stone with a refractive index and a dispersion roughly equal to those of diamond.

Par ces caractéristiques, on obtient des effets optiques de jeux de lumière particulièrement importants.By these characteristics, optical effects of light effects are obtained particularly important.

Avantageusement, ledit axe de symétrie géométrique central correspond à un des axes de symétrie cristallographiques ternaires du diamant.Advantageously, said central geometric axis of symmetry corresponds to one of the axes of ternary crystallographic symmetry of the diamond.

Cette caractéristique permet d'obtenir une taille facilitée et sûre de la table par clivage du diamant selon l'une des faces de l'octaèdre. En outre, la qualité de la taille des facettes peut ainsi être prédéterminée et s'effectuer avec grande précision.This feature makes it easier and safer to size the table. by cleavage of the diamond along one of the faces of the octahedron. In addition, the quality of the size of the facets can thus be predetermined and be carried out with great precision.

L'invention concerne également un procédé de taille d'une gemme, en particulier d'un diamant caractérisé par le fait que l'on taille en premier lieu toutes les facettes de la couronne et de la culasse et que l'on découpe ensuite le pourtour lobé de la rondiste en effectuant la forme lobée avec six portions en saillie arrondies et six portions en creux arrondies.The invention also relates to a method for cutting a gem, by peculiar to a diamond characterized by the fact that we first cut all the facets of the crown and the cylinder head and that we then cut the lobed perimeter of the rondist by performing the lobed form with six portions in rounded projection and six rounded hollow portions.

D'autres avantages ressortent des caractéristiques exprimées dans les revendications dépendantes et de la description exposant ci-après l'invention plus en détail à l'aide de dessins qui représentent schématiquement et à titre d'exemple deux modes d'exécution.Other advantages emerge from the characteristics expressed in the dependent claims and the following description of the invention further in detail using drawings which represent schematically and as example two modes of execution.

Les figures 1, 2 et 3 sont des vues de dessus, de dessous et latérale d'un premier mode d'exécution.Figures 1, 2 and 3 are top, bottom and side views of a first mode of execution.

La figure 4 représente certaines caractéristiques du contour extérieur de la rondiste du premier mode d'exécution.FIG. 4 represents certain characteristics of the external contour of the first mode executioner.

Les figures 5, 6 et 7 sont des vues de dessus, de dessous et latérale d'un second mode d'exécution.Figures 5, 6 and 7 are top, bottom and side views of a second mode of execution.

La gemme taillée représentée aux figures 1 à 3 est un diamant et comprend une couronne 10 et une culasse 11 séparées par une rondiste 12. La forme géométrique de la taille de ce diamant présente une symétrie hexagonale avec en tant qu'élément de symétrie principal un axe de rotation hexagonal 14. Les facettes de la taille sont donc arrangées autour de cet axe suivant un arrangement hexagonal.The cut gem shown in Figures 1 to 3 is a diamond and includes a crown 10 and a cylinder head 11 separated by a rondist 12. The shape geometric cut of this diamond has a hexagonal symmetry with in as a main element of symmetry a hexagonal axis of rotation 14. The facets of the size are therefore arranged around this axis according to an arrangement hexagonal.

Cet axe de symétrie géométrique correspond de préférence à un des axes cristallographiques ternaires de la structure cristalline du diamant, si la forme géométrique du diamant brut à tailler le permet. La table 16 et le plan de la rondiste 12 seront donc parallèles à une des facettes de l'octaèdre du diamant brut, ce qui permettra d'obtenir l'emplacement de la table 16 par clivage du diamant brut, en évitant un sciage fastidieux comme cela est généralement nécessaire lorsque la table est perpendiculaire à un des axes cristallographiques d'ordre quatre du diamant.This axis of geometric symmetry preferably corresponds to one of the axes ternary crystallographic of the crystal structure of the diamond, if the shape geometric of the rough diamond to be cut allows it. Table 16 and the plan of the rondist 12 will therefore be parallel to one of the facets of the diamond octahedron gross, which will make it possible to obtain the location of table 16 by cleavage of the rough diamond, avoiding tedious sawing as is generally the case necessary when the table is perpendicular to one of the crystallographic axes of order four of the diamond.

Le contour 20 de la rondiste 12 vu perpendiculairement à l'axe hexagonal 14, tel qu'illustré à la figure 4, présente une forme lobée avec six portions en saillie arrondies 21 et six portions en creux arrondies 22. Ainsi, la rondiste 12 possède un diamètre extérieur D maximal, un diamètre intérieur Di minimal et un diamètre moyen Dm intermédiaire. Les portions en saillie 21 possède un rayon de courbure r2 qui est sensiblement égal à 0,125 D, tandis que le rayon de courbure r3 des portions en creux 22 est sensiblement égal à 0,062 D. The contour 20 of the rondist 12 seen perpendicular to the hexagonal axis 14, as illustrated in FIG. 4, has a lobed shape with six projecting portions rounded 21 and six rounded hollow portions 22. Thus, the rondist 12 has a maximum outside diameter D, a minimum inside diameter Di and a diameter medium Dm intermediate. The projecting portions 21 have a radius of curvature r2 which is substantially equal to 0.125 D, while the radius of curvature r3 of recessed portions 22 is substantially equal to 0.062 D.

La couronne 10 comprend une table 16 à contour hexagonal ou sensiblement hexagonal selon la précision de la taille. Six premières facettes triangulaires 25 partagent chacune une de leurs arêtes avec une arête de la table. Six secondes facettes 26 sont intercalées entre les premières facettes et six troisièmes facettes 27 partagent une de leurs arêtes avec une arête des secondes facettes 26 et font la liaison avec la rondiste 12.The crown 10 includes a table 16 with a hexagonal outline or substantially hexagonal depending on the size precision. First six facets triangular 25 each share one of their edges with an edge of the table. Six second facets 26 are inserted between the first facets and six third facets 27 share one of their edges with a second edge facets 26 and make the connection with the rondist 12.

La culasse 11 possède six quatrièmes facettes 28 et douze cinquièmes facettes 29 disposées près de la rondiste de part et d'autre des arêtes séparant les quatrièmes facettes, et six sixièmes facettes 30 disposées près du culot 31 partiellement entre deux quatrièmes facettes 28 voisines.The cylinder head 11 has six fourth facets 28 and twelve fifths facets 29 arranged near the rondiste on either side of the edges separating the fourth facets, and six sixth facets 30 arranged near the base 31 partially between two neighboring fourth facets 28.

Les secondes, troisièmes et quatrièmes facettes 26, 27, 28, ainsi que les portions en creux 22 de la rondiste sont arrangées selon une première position angulaire identique autour de l'axe géométrique hexagonal, tandis que les premières et sixièmes facettes 25, 30 et les portions en saillie 21 se trouvent dans une seconde position angulaire décalée de 30° de la première position angulaire. Il y a donc une correspondance prédéterminée entre les facettes de la couronne, celles de la culasse et le contour de la rondiste.The second, third and fourth facets 26, 27, 28, as well as the recessed portions 22 of the rondist are arranged in a first position identical angular around the hexagonal geometric axis, while the first and sixth facets 25, 30 and the projecting portions 21 are found in a second angular position offset by 30 ° from the first angular position. There is therefore a predetermined correspondence between the facets of the crown, those of the cylinder head and the outline of the rondiste.

La hauteur H de la gemme taillée entre sa table et son culot est de préférence comprise entre 0,55 et 0,75 D, avantageusement 0,6 D. La hauteur Ht de la couronne au-dessus du plan de la rondiste est de préférence 0,13 D, et la hauteur Hc de la culasse est de préférence 0,47 D. Les premières 25, respectivement deuxièmes 26, respectivement troisièmes 27, respectivement quatrièmes 28 et respectivement sixièmes facettes 30 font des angles compris entre 10° et 25°, respectivement 10° et 25°, respectivement 25°et 35°, respectivement 35° à 55° et respectivement 25° à 35°.The height H of the gem cut between its table and its base is preferably between 0.55 and 0.75 D, advantageously 0.6 D. The height Ht of the crown above the plane of the rondist is preferably 0.13 D, and the height Hc of the cylinder head is preferably 0.47 D. The first 25, respectively second 26, respectively third 27, respectively fourth 28 and sixth facet 30 respectively make angles included between 10 ° and 25 °, respectively 10 ° and 25 °, respectively 25 ° and 35 °, respectively 35 ° to 55 ° and respectively 25 ° to 35 °.

De préférence, les troisièmes et quatrièmes facettes 27 et 28 de part et d'autre de la rondiste font un angle de 30° et de 42° avec le plan de la rondiste 12.Preferably, the third and fourth facets 27 and 28 on the one hand and on the other of the rondist make an angle of 30 ° and 42 ° with the plane of the rondist 12.

Le procédé de taille de cette gemme comprend en premier lieu l'obtention de la table, de préférence par clivage parallèlement à une des faces de l'octaèdre et ensuite, après l'ébrutage, la taille des différentes facettes de la couronne et de la culasse. On découpe finalement le pourtour lobé de la forme étoilée de la rondiste 12 avec ses six portions en saillie et en creux. Cette découpe est faite de préférence à l'aide d'un appareil de découpage à laser. Les surfaces de découpage de la rondiste 12 sont ensuite polies et nettoyées jusqu'à ce que toutes traces de taches noires de carbone dues à des brûlures par le laser aient disparues. Le poids du diamant taillé conserve environ 25 à 30% du poids du diamant brut; cette taille ne présente donc pas un rendement élevé. Par contre, les diamants taillés suivant cette taille permettent d'obtenir des réflexions totales internes présentant une structure et forme d'image hexagonales et lobées, ce qui confère à la gemme des effets optiques nouveaux et originaux. Cette symétrie hexagonale combinée à des réflexions totales internes sur les facettes de la culasse et à une réfraction différentielle sur les facettes de la couronne permet d'obtenir un feu remarquable et original du fait de sa répartition hexagonale et des lobes périphériques.The method of cutting this gem firstly involves obtaining of the table, preferably by cleavage parallel to one of the faces of the octahedron and then, after the bruting, the size of the different facets of the crown and the breech. We finally cut the lobed periphery of the star shape of the rondist 12 with its six protruding and recessed portions. This cut is made of preferably using a laser cutting device. The surfaces of cutting of the rondiste 12 are then polished and cleaned until all traces of carbon black spots due to laser burns have missing. The weight of the cut diamond retains approximately 25 to 30% of the weight of the cut diamond. rough diamond; this size therefore does not have a high yield. On the other hand, diamonds cut according to this size allow to obtain total reflections internal with hexagonal and lobed image structure and shape, which gives the gem new and original optical effects. This symmetry hexagonal combined with total internal reflections on the facets of the breech and a differential refraction on the facets of the crown allows obtain a remarkable and original fire due to its hexagonal distribution and peripheral lobes.

Le second mode d'exécution illustré aux figures 5 à 7 comprend également une couronne 10 et une culasse 11 séparées par une rondiste 12. L'ensemble présente aussi une forme géométrique hexagonale avec un axe de symétrie central hexagonal 14 autour duquel sont arrangées les facettes suivant une symétrie hexagonale. L'axe de symétrie géométrique peut de préférence également correspondre à un des axes de symétrie ternaires de la structure cristallographique du diamant. La rondiste 12 possède aussi une forme lobée avec six portions en saillie arrondies 21 et six portions en creux arrondies 22 dont les rayons de courbure peuvent être similaires à ceux du premier mode d'exécution.The second embodiment illustrated in Figures 5 to 7 also includes a crown 10 and a cylinder head 11 separated by a rondist 12. The assembly also has a hexagonal geometric shape with an axis of symmetry hexagonal central 14 around which the facets are arranged in a hexagonal symmetry. The axis of geometric symmetry can preferably also correspond to one of the ternary axes of symmetry of the structure diamond crystallography. Rondiste 12 also has a lobed shape with six rounded projecting portions 21 and six rounded recessed portions 22, the radii of curvature can be similar to those of the first embodiment.

La couronne 10 possède ici, au lieu d'une table, un apex 50 formé par six premières facettes triangulaires 55 arrangées suivant une première position angulaire autour de l'axe géométrique hexagonal 14. Six secondes facettes 56 sont arrangées dans une position médiane suivant une seconde position angulaire décalée de 30° de la première position angulaire et six troisièmes facettes disposées à proximité de la rondiste suivant la première position angulaire. La culasse 12 présente douze quatrièmes facettes 58 arrangées à proximité de la rondiste 12 et douze cinquièmes facettes 59 formant le culot 61 et disposées chacune entre deux quatrièmes facettes dans une position angulaire décalée de 15° par rapport à celle des quatrièmes facettes.The crown 10 has here, instead of a table, an apex 50 formed by six first triangular facets 55 arranged in a first position angular around the hexagonal geometric axis 14. Six second facets 56 are arranged in a middle position along a second angular position offset by 30 ° from the first angular position and six third facets arranged near the rondist according to the first angular position. The breech 12 has twelve fourth facets 58 arranged near the rondist 12 and twelve fifth facets 59 forming the base 61 and arranged each between two fourth facets in an angular position offset by 15 ° compared to that of the fourth facets.

Les portions en creux 22, les premières et les troisièmes facettes 55, 57 et la moitié 58a des quatrièmes facettes sont arrangées suivant la première position angulaire. Les portions en saillie 21, les secondes facettes 56 et l'autre moitié 58B des quatrièmes facettes sont disposées suivant la seconde position angulaire.The recessed portions 22, the first and the third facets 55, 57 and half 58a of the fourth facets are arranged in the first position angular. The projecting portions 21, the second facets 56 and the other half 58B fourth facets are arranged in the second angular position.

La hauteur H entre l'apex 50 et le culot 61 est comprise entre 0,5 et 0,75 fois le diamètre extérieur D de la rondiste 12. De préférence, cette hauteur H, celle Ht de la couronne et celle Hc de la culasse sont 0,52 D, 0,18 D et 0,35 D.The height H between the apex 50 and the base 61 is between 0.5 and 0.75 times the outside diameter D of the rondist 12. Preferably, this height H, that Ht of the crown and that Hc of the cylinder head are 0.52 D, 0.18 D and 0.35 D.

Les premières 55, respectivement deuxièmes 56, respectivement troisièmes 57, respectivement cinquièmes facettes 59 font avec le plan de la rondiste des angles compris entre 8° et 20°, respectivement 20° et 27°, respectivement 20° et 32°, respectivement 30° à 50°. De préférence, les deuxièmes et cinquièmes facettes 56 et 59 de part et d'autre de la rondiste font un angle de 23° et 34° avec le plan de la rondiste 12.The first 55, respectively second 56, respectively third 57, respectively fifth facets 59 do with the plane of the rondist of angles between 8 ° and 20 °, respectively 20 ° and 27 °, respectively 20 ° and 32 °, respectively 30 ° to 50 °. Preferably, second and fifth facets 56 and 59 on either side of the rondist make a 23 ° and 34 ° angle with the plane of the rondist 12.

Le procédé de taille est similaire du fait que l'on taille d'abord les facettes de la couronne 10 et de la culasse 11 autour de l'axe hexagonal 14, qui correspond de préférence à l'axe ternaire cristallographique du diamant, et que l'on découpe ensuite le pourtour de forme lobée de la rondiste de préférence avec un laser.The cutting process is similar in that the facets are first cut of the crown 10 and of the cylinder head 11 around the hexagonal axis 14, which preferably corresponds to the crystallographic ternary axis of the diamond, and that we then cut the lobed perimeter of the rondiste preferably with a laser.

Il est bien entendu que les modes de réalisation décrits ci-dessus ne présentent aucun caractère limitatif et qu'ils peuvent recevoir toutes modifications désirables à l'intérieur du cadre tel que défini par la revendication 1. En particulier, la taille selon l'invention pourra également être effectuée sur d'autres pierres et gemmes comportant un indice de réfraction et une dispersion similaires ou sensiblement égaux à ceux du diamant. Il y aura éventuellement lieu d'adapter les angles d'inclinaison des facettes en tenant compte des indices de réfraction des pierres de substitution. Ainsi, les angles des facettes pourront également être changés selon la forme des pierres brutes. D'autres facettes supplémentaires pourront être ajoutées. Ces facettes pourront selon le cas uniquement être au nombre de trois par type de facettes. La découpe de la rondiste pourra en outre être obtenue par tous autres moyens adéquats.It is understood that the embodiments described above do not have no limiting nature and that they can receive any modifications desirable within the framework as defined by claim 1. In particular, the cutting according to the invention can also be carried out on other stones and gems with similar refractive index and dispersion, or roughly equal to those of diamond. It may be necessary to adapt the angles of inclination of the facets taking into account the refractive indices of the substitute stones. Thus, the angles of the facets can also be changed according to the shape of the rough stones. Other additional facets can be added. These facets may only be as appropriate number of three per type of facets. The cutout of the rounder may also be obtained by any other suitable means.

Claims (14)

Gemme taillée comprenant un premier nombre prédéterminé de facettes (25 à 27; 55 à 57) taillée dans la couronne (10) et un second nombre prédéterminé de facettes (28, 29; 58, 59) taillées dans la culasse (11) autour d'un axe de symétrie géométrique central, caractérisée par le fait que lesdites facettes de la couronne et de la culasse sont disposées autour dudit axe de symétrie (14) suivant un arrangement sensiblement hexagonal et par le fait que la rondiste (12) séparant la couronne (10) de la culasse (11) présente un contour de forme lobée (20) avec six portions en saillie (21) arrondies et six portions en creux (22) arrondies.Cut gem comprising a first predetermined number of facets (25 to 27; 55 to 57) cut in the crown (10) and a second predetermined number of facets (28, 29; 58, 59) cut in the cylinder head (11) around a central geometric axis of symmetry, characterized by the fact that said facets of the crown and of the cylinder head are arranged around said axis of symmetry (14) along a substantially hexagonal arrangement and by the fact that the rondiste (12) separating the crown (10) from the cylinder head (11) has a lobed contour (20) with six projecting portions (21) rounded and six rounded recessed portions (22). Gemme selon la revendication 1, caractérisée par le fait qu'elle est constituée par du diamant ou une pierre comportant un indice de réfraction et une dispersion sensiblement égaux à ceux du diamant.Gem according to claim 1, characterized in that it is consisting of diamond or a stone with an index of refraction and dispersion substantially equal to that of diamond. Gemme selon la revendication 2, caractérisée par le fait que ledit axe de symétrie géométrique central (14) correspond à un des axes de symétrie cristallographiques ternaires du diamant.Gem according to claim 2, characterized in that said axis of central geometric symmetry (14) corresponds to one of the axes of ternary crystallographic symmetry of the diamond. Gemme selon l'une des revendications précédentes, caractérisée par le fait que la couronne (10) comprend une table (16) à contour sensiblement hexagonal, et au moins six premières facettes triangulaires (25) partageant chacune une de leurs arêtes avec une arête de la table, six secondes facettes (26) intercalées entre les six premières facettes et six troisièmes facettes (27) partageant chacune une de leurs arêtes avec une arête des secondes facettes. Gem according to one of the preceding claims, characterized by the fact that the crown (10) comprises a table (16) with an outline substantially hexagonal, and at least six first facets triangular (25) each sharing one of their edges with a edge of the table, six second facets (26) inserted between the six first facets and six third facets (27) each sharing one of their edges with an edge of the second facets. Gemme selon l'une des revendications précédentes, caractérisée par le fait que la culasse (11) comprend au moins six quatrièmes facettes (28) et douze cinquièmes facettes (29) disposées près de la rondiste de part et d'autre des arêtes séparant les quatrièmes facettes (28), et six sixièmes facettes (30) disposées près du culot (31) au moins partiellement entre deux quatrièmes facettes (28) voisines.Gem according to one of the preceding claims, characterized by the fact that the cylinder head (11) comprises at least six fourth facets (28) and twelve fifth facets (29) arranged near the rondiste on either side of the edges separating the fourth facets (28), and six sixth facets (30) arranged near the base (31) at least partially between two neighboring fourth facets (28). Gemme selon les revendications 4 et 5, caractérisée par le fait que les secondes, troisièmes et quatrièmes facettes (26, 27, 28) sont arrangées selon une première position angulaire identique autour dudit axe géométrique (14) et par le fait que les six portions en creux (22) de la rondiste sont arrangées suivant cette première position angulaire, tandis que les premières et les sixièmes facettes (25, 30) et les portions en saillie (21) sont arrangées suivant une seconde position angulaire décalée de 30° de la première position angulaire.Gem according to claims 4 and 5, characterized in that the second, third and fourth facets (26, 27, 28) are arranged at a first identical angular position around of said geometric axis (14) and by the fact that the six hollow portions (22) of the rondist are arranged according to this first position angular, while the first and sixth facets (25, 30) and the protruding portions (21) are arranged in a second angular position offset by 30 ° from the first angular position. Gemme selon la revendication 6, caractérisée par le fait que sa hauteur (H) entre la table (16) et le culot (31) est comprise entre 0,55 et 0,75 fois le diamètre extérieur (D) de la rondiste (12), que les premières (25), respectivement secondes (26), respectivement troisièmes (27), respectivement quatrièmes (28) et respectivement sixièmes facettes (30) font des angles compris entre 10° et 25°, respectivement 10° et 25°, respectivement 25° et 35°, respectivement 35° à 55° et respectivement 25° à 35° avec le plan de la rondiste (12).Gem according to claim 6, characterized in that its height (H) between the table (16) and the base (31) is between 0.55 and 0.75 times the outside diameter (D) of the rondist (12), that the first (25), respectively second (26), respectively third (27), respectively fourth (28) and respectively sixth facets (30) make angles between 10 ° and 25 °, respectively 10 ° and 25 °, respectively 25 ° and 35 °, respectively 35 ° to 55 ° and respectively 25 ° to 35 ° with the map of the rondist (12). Gemme selon l'une des revendications 1 à 3, caractérisée par le fait que la couronne (10) comprend un apex (50) et, formant ce dernier, six premières facettes (55) arrangées suivant une première position angulaire autour dudit axe géométrique, six secondes facettes (56) arrangées dans une position médiane suivant une seconde position angulaire décalée de 30° des premières facettes (55) et six troisièmes facettes (57) arrangées à proximité de la rondiste (12) suivant la première position angulaire.Gem according to one of claims 1 to 3, characterized in that that the crown (10) comprises an apex (50) and, forming the latter, first six facets (55) arranged in a first position angular around said geometric axis, six second facets (56) arranged in a middle position following a second position angular offset by 30 ° from the first facets (55) and six third facets (57) arranged near the rondiste (12) according to the first angular position. Gemme selon l'une des revendications 1 à 3 et 8, caractérisée par le fait que la culasse (11) comprend au moins douze quatrièmes facettes (58) arrangées à proximité de la rondiste (12) et douze cinquièmes facettes (59) arrangées près du culot (14), chacune partiellement entre deux quatrièmes facettes (58) dans une position angulaire décalée de 15° par rapport à ces dernières.Gem according to one of claims 1 to 3 and 8, characterized by the the breech (11) comprises at least twelve fourths facets (58) arranged near the rondiste (12) and twelve fifth facets (59) arranged near the base (14), each partially between two fourth facets (58) in one position angularly offset by 15 ° from the latter. Gemme selon les revendications 8 et 9, caractérisée par le fait que les portions en creux (22), les premières et troisièmes facettes (55, 57) et la moitié des quatrièmes facettes (55a) sont arrangées suivant ladite première position angulaire et les portions en saillie (21), les secondes facettes (56) et l'autre moitié (55b) des quatrièmes facettes sont arrangées suivant la seconde position angulaire.Gem according to claims 8 and 9, characterized in that the recessed portions (22), the first and third facets (55, 57) and half of the fourth facets (55a) are arranged according to said first angular position and the projecting portions (21), the second facets (56) and the other half (55b) of the fourth facets are arranged according to the second angular position. Gemme selon la revendication 10, caractérisée par le fait que sa hauteur (H) entre l'apex (50) et le culot (61) est comprise entre 0,5 et 0,75 fois le diamètre extérieur (D) de la rondiste (12), que les premières (55), respectivement deuxièmes (56), respectivement troisièmes (57), respectivement cinquièmes (59) facettes font des angles compris entre 8° et 20°, respectivement 20° et 27°, respectivement 20° et 32°, respectivement 30° à 50° avec le plan de la rondiste (12). Gem according to claim 10, characterized in that its height (H) between the apex (50) and the base (61) is between 0.5 and 0.75 times the outside diameter (D) of the rondist (12), that the first (55), respectively second (56), respectively third (57), respectively fifth (59) facets make angles between 8 ° and 20 °, respectively 20 ° and 27 °, respectively 20 ° and 32 °, respectively 30 ° to 50 ° with the plane of the rondist (12). Gemme selon la revendication 1, caractérisée par le fait que les portions en saillie (21) de la rondiste présentent un rayon de courbure sensiblement égal à 0,125 fois le diamètre extérieur (D) de la rondiste (12) et par le fait que les portions en creux (22) de la rondiste présentent un rayon de courbure sensiblement égal à 0,062 fois le diamètre extérieur (D) de la rondiste (12).Gem according to claim 1, characterized in that the protruding portions (21) of the rondist have a radius of curvature substantially equal to 0.125 times the outside diameter (D) of the rondiste (12) and by the fact that the hollow portions (22) of the Rondiste have a radius of curvature substantially equal to 0.062 times the outside diameter (D) of the rondist (12). Procédé de taille d'une gemme selon la revendication 1, caractérisé par le fait que l'on taille en premier lieu toutes les facettes de la couronne (10) et de la culasse (11) et que l'on découpe ensuite le pourtour lobé (20) de la rondiste (12) en effectuant la forme lobée avec six portions en saillie (21) arrondies et six portions en creux (22) arrondies.Gem-cutting method according to claim 1, characterized by the fact that we first cut all facets of the crown (10) and the cylinder head (11) and then cut the lobed periphery (20) of the rondist (12) by performing the lobed form with six rounded projecting portions (21) and six recessed portions (22) rounded. Procédé de taille selon la revendication 13, caractérisé par le fait que l'on taille le pourtour lobé (20) de la rondiste (12) à l'aide d'un appareil de découpage à laser et que l'on polit ensuite la surface de découpe de la rondiste.Pruning method according to claim 13, characterized in that we cut the lobed periphery (20) of the rondiste (12) using a laser cutting machine and then polish the surface of cutout of the rondist.
EP00125864A 1999-12-23 2000-11-25 Cut gemstone, especially cut diamond Expired - Lifetime EP1110472B1 (en)

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CN1307961A (en) 2001-08-15
ES2222148T3 (en) 2005-02-01
DE60012463D1 (en) 2004-09-02
EP1110472B1 (en) 2004-07-28
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CN1188262C (en) 2005-02-09
US6405562B1 (en) 2002-06-18

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