EP1110472B1 - Cut gemstone, especially cut diamond - Google Patents

Cut gemstone, especially cut diamond Download PDF

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Publication number
EP1110472B1
EP1110472B1 EP00125864A EP00125864A EP1110472B1 EP 1110472 B1 EP1110472 B1 EP 1110472B1 EP 00125864 A EP00125864 A EP 00125864A EP 00125864 A EP00125864 A EP 00125864A EP 1110472 B1 EP1110472 B1 EP 1110472B1
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Prior art keywords
facets
girdle
fact
gem
cut
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German (de)
French (fr)
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EP1110472A1 (en
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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

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  • the present invention relates to a cut gem consisting of diamond or a stone comprising at least one axis of crystallographic symmetry ternary and a refractive index and a dispersion substantially equal to those of the diamond, comprising a first predetermined number of facets cut in the crown and a second predetermined number of facets cut in the cylinder head around a central geometric axis of symmetry, said facets of the crown and the cylinder head are arranged around said central geometric axis of symmetry in a substantially hexagonal arrangement.
  • GB-A-1.015.389 we reveal gems with a size resembling flowers with eight or sixteen petals of convex shape circular arranged around a central geometric axis.
  • the outer contour can be straight, pointed or sinusoidal.
  • US-D-384,592 illustrates diamond cuts with a flower shape with four petals with rounded outer outline separated by a point-like trough.
  • the object of the present invention is to create a gem of a size new to obtain original optical effects and a design of different shape, while retaining the intensity of the shine and fire of the sizes "Brilliant" known, and while seeking to facilitate the size and increase the accuracy of the latter.
  • the invention is characterized for this purpose by the characteristics appearing in the second part of claim 1.
  • the gem thus cut, sends back to the observer an image with a play of light reflections and six-pointed star differential colorings where the rounded protruding portions separated by rounded hollow portions send shimmering, original optical effects to the observer allowing to obtain a facilitated size and a quality of facet size improved and high accuracy.
  • the invention also relates to a method for cutting a gem, characterized by the fact that all the facets of the crown and cylinder head and then cut the lobed periphery of the rondist by performing the lobed shape with six rounded protruding portions and six rounded intaglio 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 corresponds to one of the axes ternary crystallographic of the crystal structure of the diamond .
  • 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 protruding portions 21 has 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 rondiste 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. So there is 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, 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 about 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 FIGS. 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 corresponds 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 57 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 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 that 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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Description

La présente invention concerne une gemme taillée constituée par du diamant ou une pierre comportant au moins un axe de symétrie cristallographique ternaire et un indice de réfraction et une dispersion sensiblement égaux à ceux du diamant, 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, lesdites facettes de la couronne et de la culasse sont disposées autour dudit axe de symétrie géométrique central suivant un arrangement sensiblement hexagonal.The present invention relates to a cut gem consisting of diamond or a stone comprising at least one axis of crystallographic symmetry ternary and a refractive index and a dispersion substantially equal to those of the diamond, comprising a first predetermined number of facets cut in the crown and a second predetermined number of facets cut in the cylinder head around a central geometric axis of symmetry, said facets of the crown and the cylinder head are arranged around said central geometric axis of symmetry in a substantially hexagonal arrangement.

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 crystal optics so as to obtain the better performance 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. Note 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 thus developed more and more brilliant sizes. 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.

Par le document FR-A-323618 on connaít une forme de diamant taillée conformément aux caractéristiques figurant dans le préambule de la revendication 1.By document FR-A-323618 we know a shape of cut diamond in accordance with the features set out in the preamble to the claim 1.

Le document "5 NOUVELLES TAILLES POUR LE DIAMANT " LA FRANCE HORLOGERE, FR, SOCIETE MILLOT ET CIE. BESANÇON, no.497, 1 novembre 1988 (1988-11-01), pages 154-159 décrit également une taille de diamant avec un arrangement hexagonal des facettes de la couronne et de la culasse disposées autour d'un axe de symétrie géométrique central.The document "5 NEW SIZES FOR THE DIAMOND" FRANCE CLOCKWORK, FR, SOCIETE MILLOT ET CIE. BESANÇON, no.497, November 1 1988 (1988-11-01), pages 154-159 also describes a diamond cut with a hexagonal arrangement of the crown and cylinder head facets arranged around a central geometric axis of symmetry.

Dans le document GB-A-1.015.389 on révèle des gemmes avec une taille ayant la ressemblance de fleurs avec huit ou seize pétales de forme convexe circulaire arrangées autour d'un axe géométrique central. Selon des variantes le contour extérieur peut être droit, pointu ou sinusoïdal.In GB-A-1.015.389 we reveal gems with a size resembling flowers with eight or sixteen petals of convex shape circular arranged around a central geometric axis. According to variants the outer contour can be straight, pointed or sinusoidal.

Similairement, le document US-D-384 592 illustre des tailles de diamant présentant une forme de fleur avec quatre pétales à contour extérieur arrondi séparées par un creux en forme de pointe.Similarly, US-D-384,592 illustrates diamond cuts with a flower shape with four petals with rounded outer outline separated by a point-like trough.

Le but de la présente invention est de créer une gemme d'une taille nouvelle 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, et tout en recherchant à faciliter la taille et à augmenter la précision de cette dernière.The object of the present invention is to create a gem of a size new to obtain original optical effects and a design of different shape, while retaining the intensity of the shine and fire of the sizes "Brilliant" known, and while seeking to facilitate the size and increase the accuracy of the latter.

L'invention est caractérisée à cet effet par les caractéristiques figurant dans la seconde partie de la revendication 1.The invention is characterized for this purpose by the characteristics appearing in the second part of claim 1.

La gemme, ainsi taillée, renvoie vers l'observateur une image avec un jeu de réflexions de lumière et de colorations différentielles étoilées à six branches où les portions en saillies arrondies séparées par des portions en creux arrondies renvoient vers l'observateur des effets optiques chatoyants, originaux tout en permettant d'obtenir une taille facilitée et une qualité de taille des facettes améliorée et de grande précision.The gem, thus cut, sends back to the observer an image with a play of light reflections and six-pointed star differential colorings where the rounded protruding portions separated by rounded hollow portions send shimmering, original optical effects to the observer allowing to obtain a facilitated size and a quality of facet size improved and high accuracy.

L'invention concerne également un procédé de taille d'une gemme, 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, characterized by the fact that all the facets of the crown and cylinder head and then cut the lobed periphery of the rondist by performing the lobed shape with six rounded protruding portions and six rounded intaglio 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 à un des axes cristallographiques ternaires de la structure cristalline du diamant . 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 corresponds to one of the axes ternary crystallographic of the crystal structure of the diamond . 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 protruding portions 21 has 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 rondiste 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. So there is 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, 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, 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 about 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 illuatré 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 correspond également 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 FIGS. 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 corresponds 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 57 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 57 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 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 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 that 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 (12)

  1. Cut gem constituted of diamond or a stone having at least a ternary crystallographic axis of symmetry and an index of refraction and a dispersion substantially equal to those of diamond, 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, 30; 58, 59) cut in the pavilion (11) about a central geometric axis of symmetry (14), said crown facets and pavilion facets being disposed about said central geometric axis of symmetry in a substantially hexagonal arrangement, characterized by the fact that the girdle (12) separating the crown (10) and the pavilion (11) has a contour (20) of lobed shape with six rounded projecting portions (21) and six rounded hollow portions (22) and by the fact that said central geometric axis of symmetry (14) corresponds to a ternary crystallographic axis of symmetry of the gem.
  2. Gem according to claim 1, characterized by the fact that the crown (10) comprises a table (16) with a substantially hexagonal contour, and at least six first triangular facets (25) each sharing one of their edges with an edge of the table, six second facets (26) interposed between the six first facets and six third facets (27) each sharing one of their edges with an edge of the second facets.
  3. Gem according to claim 1 or 2, characterized by the fact that the pavilion (11) comprises at least six fourth facets (28) and twelve fifth facets (29) disposed adjacent the girdle on opposite sides of the edges separating the fourth facets (28), and six sixth facets (30) disposed adjacent the culet (31) at least partially between two adjacent fourth facets (28).
  4. Gem according to claims 2 and 3, characterized by the fact that the second, third and fourth facets (26, 27, 28) are arranged according to a first identical angular position about said geometric axis (14) and by the fact that the six hollow portions (22) of the girdle are arranged according to this first angular position, whereas the first and sixth facets (25, 30) and the projecting portions (21) are arranged according to a second angular position offset by 30° from the first angular position.
  5. Gem according to claim 4, characterized by the fact that its height (H) between the table (16) and the culet (31) is comprised between 0.55 and 0.75 times the external diameter (D) of the girdle (12), that the first (25), respectively second (26), respectively third (27), respectively fourth (28) and respectively sixth facets (30) form angles comprised between 10° and 25°, respectively 10° and 25°, respectively 25° and 35°, respectively 35° to 55° and respectively 25° to 35° with the plane of the girdle (12).
  6. Gem according to claim 1, characterized by the fact that the crown (10) comprises an apex (50) and, forming this latter, six first facets (55) arranged according to the first angular position about said geometric axis, six second facets (56) arranged in an intermediate position according to a second angular position offset by 30° from the first facets (55) and six third facets (57) arranged adjacent the girdle (12) in the first angular position.
  7. Gem according to claim 1 or 6, characterized by the fact that the pavilion (11) comprises at least twelve fourth facets (58) arranged adjacent to the girdle (12) and twelve fifth facets (59) arranged adjacent the culet (14), each partially between two fourth facets (58) in an angular position offset by 15° relative to these latter.
  8. Gem according to claims 6 and 7, characterized by the fact that the hollow portions (22) of the girdle, the first and third facets (55, 57) and half the fourth facets (58a) are arranged according to said first angular position ant the projecting portions (21) of the girdle, the second facets (56) and the other half (58b) of the fourth facets are arranged according to the second angular position.
  9. Gem according to claim 8, characterized by the fact that its height (H) between the apex (50) and the culet (61) is comprised between 0.5 and 0.75 times the external diameter (D) of the girdle (12), that the first (55), respectively second (56), respectively third (57), respectively fifth (59) facets form angles comprised between 8° and 20°, respectively 20° and 27°, respectively 20° and 32°, respectively 30° to 50° with the plane of the girdle(12).
  10. Gem according to claim 1, characterized by the fact that the projecting portions (21) of the girdle have a radius of curvature (r2) substantially equal to 0.125 times the external diameter (D) of the girdle (12) and by the fact that the hollow portions (22) of the girdle have a radius of curvature (r3) substantially equal to 0.062 times the external diameter (D) of the girdle (12).
  11. Process for cutting a gem according to claim 1, characterized by the fact that first all the crown (10) facets and the pavilion (11) facets are cut about the central geometric axis of symmetry (14), which corresponds to a ternary crystallographic axis of the gem, and that then the lobed periphery (20) of the girdle (12) is cut by forming the lobed shape with six rounded projecting portions (21) and six rounded hollow portions (22).
  12. Cutting process according to claim 11, characterized by the fact that the lobed periphery (20) of the girdle (12) is cut with a laser cutting apparatus and that then the cut surface of the girdle is polished.
EP00125864A 1999-12-23 2000-11-25 Cut gemstone, especially cut diamond Expired - Lifetime EP1110472B1 (en)

Applications Claiming Priority (2)

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CH237099 1999-12-23
CH02370/99A CH693938A5 (en) 1999-12-23 1999-12-23 Gem cut, especially cut diamond.

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EP1110472B1 true EP1110472B1 (en) 2004-07-28

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HK1037308A1 (en) 2002-02-08
DE60012463T2 (en) 2005-09-15
CN1307961A (en) 2001-08-15
JP3569492B2 (en) 2004-09-22
DE60012463D1 (en) 2004-09-02
CN1188262C (en) 2005-02-09
US6405562B1 (en) 2002-06-18
EP1110472A1 (en) 2001-06-27
ES2222148T3 (en) 2005-02-01
CH693938A5 (en) 2004-05-14

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