US3665729A - Cut ornamental gem - Google Patents

Cut ornamental gem Download PDF

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Publication number
US3665729A
US3665729A US24225A US3665729DA US3665729A US 3665729 A US3665729 A US 3665729A US 24225 A US24225 A US 24225A US 3665729D A US3665729D A US 3665729DA US 3665729 A US3665729 A US 3665729A
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United States
Prior art keywords
gem
facets
angle
facet
ornamental
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Expired - Lifetime
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US24225A
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English (en)
Inventor
Maximo Elbe
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Colorant Schmuckstein GmbH
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Colorant Schmuckstein 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 ornamental gem con sisting of a natural or a synthetic refractive material, such as diamond, zirconium, ruby, sapphire or emerald.
  • Gems of this type do not show any luster in their natural form. Only by cutting and polishing the gem, and providing its surface with facets, a luster and brilliancy is obtained due to the fact that the facets reflect the incident light at the outer and inner surfaces of the stone, and also partly disperse the light into the spectral colors.
  • a brilliant is made of a diamond by cutting the same in various ways, such as a Parker cut, a Tolkowski cut, or other known cuts. All known cuts cause a substantial loss of incident light, and also a loss of the material of the blank. Furthermore, the coloring or sparkle of the cut gem is only slight. Among other reasons, this is due to the following facts.
  • the table of a brilliant forms angles with rear facets which cause total deflection of perpendicular incident light at the rear facets.
  • the reflected light then emerges at the top portion or bezel at a maximum angle of i6".
  • the gem appears bright, but shows only few spectral colors because the critical angle of dispersion, for example 23 56' for a diamond, cannot be obtained for the emergent light.
  • Light which impinges obliquely on the table is reflected within the stone and is lost. Therefore, generally speaking, only 33 percent of the incident light is reflected out of the gem.
  • the critical angle of dispersion isdifferent for different materials, and is, for example, approximately 23 56' for a diamond.
  • the angle between optically cooperating facets is greater than 16 but less than 23 56', contrary to the position of the facets in conventional brilliants, and is as close as possible to the critical angle of dispersion so that optimum conditions are obtained.
  • the cut gem is a diamond comprising, for the passage of transmitted light rays set with three to eight clamps which not only cover the SUMMARY OF THE INVENTION It is one object of the invention to provide a cut for a gem, particularly for a diamond, which causes light entering the cut gem to emerge in a higher ratio than in gems cut in accordance with the prior art.
  • Another object of theinvention is to provide a cut for a gem.
  • Another object of the invention is to cut a gem, and particularly a diamond, in such a manner that a strong coloring is ob- I tained without any significant loss of material.
  • Another object of the invention is to mount a cut gem in such a manner that the mounting reflects light rays emerging from the cut gem.
  • Another object of the invention is to mount a cut gem in such a manner that no clamp or other part of the mounting means is located on the top portion of the gem.
  • Another object of the invention is to cut a gem in such a manner that the total reflection of light within the gem is reduced to a minimum.
  • the angles between optically cooperating opposite facets of the cut stone correspond for light rays transmitted through the gem to the angle of maximum dispersion of light into rays having the spectral colors.
  • the angle between optically cooperating opposite facets corresponds to half the angle of maximum dispersion.
  • the divergence from the angle of dispersion is within a range of a few angular degrees, and preferably corresponds to one-sixth of one angular degree.
  • the teaching of the invention particularly considers the fact that the critical angle of maximum dispersion is decisive for through the gem, optically cooperating opposite facets defining an angle within the range between 16 and 23 56.
  • the cut gem comprises optically cooperating opposite facets defining an angle of half the above-stated limits.
  • a particularly lively sparkle is obtained for a gem cut of a diamond if the gem comprises for transmitted light rays, optically cooperating opposite facets defining an angle within the range between 20 and 23 56, and for reflected light rays, optically cooperating opposite facets defining an angle which is between 10 and 11 58'.
  • optically cooperating opposite facets define angles which are greater than the critical angle of dispersion and smaller than the critical angle of reflection of the respective material so that in a diamond cut in accordance with this feature of the present invention, the angles between optically cooperating opposite facets are within a range between 23 56' and 24 30'-.
  • the sparkle is further enhanced if the bottom surface of the gem is made totally reflecting.
  • the gem may be provided with a coating which is preferably vaporized onto the surface of the gem.
  • a coating can be also used for setting the gem by soldering the coating on the bottom portion of the gem to the mounting means. It is advantageous if the gem is embedded in a seat of the mounting material only up to a depth of about one-third of its diameter so that gem projects about two-thirds of its height above the top of the mounting material. 7
  • the mounting means may also be provided with a reflecting surface preferably on a plate located at the bottom of the gem and having a mirror-reflecting surface on top.
  • a predetermined spectral color range can be further enhanced, particularly in a diamond, by a further feature of the invention according to which the bottom surface of the gem, and the reflecting surface of the mounting material are spaced from each other a fraction of a predetermined wavelength of the light.
  • a red or blue hue of the gem can be obtained, since a part of the light will be extinguished at the bottom of the gem by light reflected by the mounting material.
  • the decorative effect and particularly the sparkle of the gem can be further improved if the usual flat table is transformed into a spherical surface. If the top face of the diamond is cut as a convex spherical face, it will serve as a magnifying lens, making the gem appear larger and capturing the light in an improved manner.
  • the natural shape of the stone blank determines the radius of the spherical surface segment, assuming that as little as possible of the precious material is cut away.
  • the gem may also be provided in accordance with the invention with a similar spherical segment surface on its bottom surface, in
  • an ornamental gem cut in accordance with the invention can be adapted to the shape of the natural blankstone, a substantial advantage of the invention resides in the extremely small loss of precious material during the cutting operation.
  • a diamond can be cut to forma gem having interesting color effects, even at an intensity of the impinging light just sufficient for reading purposes.
  • FIG. 1 is a side elevation illustrating a brilliant according to the prior art
  • FIG. 2 is a side elevation illustrating a gem cut in accordance with the invention, and a mounting for the same shown in a schematic section;
  • FIG. 3 is a fragmentary sectional view illustrating a modified arrangement for mounting a gem
  • FIG. 4 is a diagrammatic view illustrating the optical conditions for dispersion of light by a facet of a diamond
  • FIG. 5 is a plan view illustrating a gem cut in accordance with the invention having sixteen comers and circumferential facets;
  • FIG. 6 is a schematic vertical sectional view illustrating the dispersion of light reflected in a gem of the invention.
  • FIG. 7 is a schematic horizontal sectional view of the gem shown in FIG. 6, and illustrating the optical conditions for light transmitted through the gem;
  • FIG. 8 is a plan view of a gem having afacet ring with nine facets and corners; 2
  • FIG. 9 is a fragmentary side view illustrating a gem set in accordance with the invention on a reflecting mounting means.
  • FIG. 10 is a fragmentary perspective view illustrating the mounted gem shown in FIG. 9.
  • FIG. 1 illustrates a brilliant according to the prior art in which light rays and 16 impinge perpendicularly on a planar table 11 and are totally'reflected at the facets of the bottom portion 14 so as to emerge again in the form of light rays 15 and 16 at the table facets or star facets 121.
  • the angle of emergence is smaller than 16 so that the dispersion is only very small. Consequently, perceptible white light emerges only from table 11.
  • Spectral colors can be perceived only on the table or star facets 121 and at the Rondist or corner facets 122, which are substantially covered by the clamps of the setting, not shown.
  • only light striking table 11 perpendicularly is totally reflected at the bottom surface 14 because only in the bottom portion the facets are positioned to obtain total reflection.
  • a great percentage of light entering the brilliant about two-thirds of the light, is lost.
  • a gem cut in accordance with the invention permits a dispersion into spectral colors due to suitable angles of emergence of light passing directly through the gem, without reflection. Reflected light is also split into spectral colors when emerging from the gem after reflection in the same.
  • FIG. 4 illustrates the refraction of a light ray emerging from the diamond and entering the air. The angle or represents the inclination of the white light ray to the perpendicular on the refractive surface, which is the angle of dispersion and the angle B represents the amount of the splitting of the colored light rays. The larger the difference between the refractive indices is for'the spectral colors red and blue, the more are the.
  • the refractive indices for red and blue are great for a diamond, and are 2.464 for blue at 0.4;tm, and 2.406 for red light at O.7p.m.
  • the diagram shows the relation between the angle of dispersion o: and the angle 5 at which the light is split.
  • the critical angle is very important for the spectral color rays of the gem. It is important to maintain the angle of incidence within a range of 30' in relation to the angle of dispersion, in order to obtain optimum results for the splitting of the spectral color rays, which is one of the objects of the invention. In the practice of diamond cutting, this does not represent any particular problems which could cause an increase of the cutting costs over the costs of conventional cuts. As far as the tooling is concerned, there is no difiiculty in cutting the required angles at a tolerance of i 10'. In the present case, and for a diamond, the critical angle of dispersion is in the range between 2330 and 2356, which corresponds to a splitting of the color spectral rays from 8 to 1257.
  • the gem will emit the more colored light, the greater a number of such angles is defined by the facets.
  • the incidence of light is dependent upon the actual lighting conditions for any particular position in which the stone is looked at at any particular moment.
  • An excellent splitting of the rays of the spectral colors may already be observed with a decahexagon having angles of 22.5, assuming the light passes directly through the gem. This is due to the fact that the light never strikes a facet in exactly perpendicular direction only.
  • the angle of incidence determines the angle of emergence, so that an angle of emergence of 2356, and therefore also maximum spreading of the spectral color rays can always take place. Nevertheless, substantial differences in the sparkle produced by differently cut gems can be noted.
  • a gem cut from a spherical diamond has the basic shape shown in FIG. 2.
  • the original shape of the raw diamond, or other stone is unsymmetrical, it can be cut in a more or less unsymmetrical arrangement of facets in a manner which produces excellent results, and a lively sparkle can be obtained without any major loss of material. Therefore, an unsymmetrically cut gem is not necessarily of a lower quality.
  • two adjacent facet rings 24 and 25 each comprise a plurality of facets arranged between the upper spherical segment face 21 which has the shape of a magnifying lens and a height which corresponds to percent of the diameter, and the lower spherical segment face 22 which has a height of about 30 percent of the diameter.
  • the number of the facet rings depends on the shape of the raw diamond and is determined by the critical angle of dispersion of 2356, and by the size of the facet. When using a diamond under consideration of the criticalangle of dispersion, an incident light ray will be totally reflected at the central spherical bottom face 22, then strike facet 25, and emerge as a ray 20 at a spreading angle of 12.
  • FIG. 3 shows only the bottom portion of a cut diamond which is set into a spherical seat in a mounting material 32, and has an annular recess or groove 31 into which an annular plate 33 projects for holding the gem.
  • Plate 33 is made integral with mounting means 32, for example, by soldering.
  • total reflection of incident light at the spherical bottom face may also be obtained by a vaporized mirror-reflecting coating of the surface of the bottom portion, or by a highly polished surface on the seat of the mounting material in which the gem is set. In both cases, the gem will be seated in the mounting means in such a manner that a major portion of the gem is completely exposed to light, as well as to viewing by an observer.
  • the setting of the gem may be effected by soldering the gem by its vaporized reflective coating to the mounting material. Due to the total reflection at the bottom part of the gem, it is impossible for light entering the stone to be lost, in contrast to the light losses of conventional brilliants.
  • FIG. 6 illustrates the condition for light reflected by a facet of the gem, and only then emerging from the same.
  • a light ray 62 strikes the table 61 perpendicularly, and is totally reflected by facet 63 of the bottom section.
  • Facet 63 has an inclination to the table face 61 which is 1 158 for a diamond.
  • the reflected light therefore strikes the table 61 at an angle of incidence of 2356, equal to the critical angle of dispersion, and emanates as the dispersed ray 62' at an angle of 1257, so that maximal dispersion is obtained.
  • FIG. 7 shows in horizontal section the conditions for transversely transmitted light.
  • Light rays 72 pass perpendicularly through the facet 71, and then strike facets 73 and 74 at the critical angle of dispersion since these facets are cut at an angle of 2356 to facet 71.
  • the light emerging from the gem at facets 73 and 74, will be split to a maximum angular width of 1257.
  • Optically cooperating facets 71,73,74 can be multiplied, and, for example, three systems of three facets can be arranged along a circle 75 as shown in FIG. 8 in which a ring of nine facets is shown.
  • the maximum error which may arise in such an arrangement amount to about 3 percent which, however, does not have any disturbing influence if irregularities due to the natural shape of the stone are present anyway.
  • the three mutually corresponding optical systems are formed by the facet 81 with facets 82,83, by facet 84 with facets 85 and 86, and by facet 87 with facets 88 and 89.
  • the critical angles of dispersion are always obtained, and cause the dispersion of incident light into dispersed light consisting of spectral color rays.
  • light which impinges perpendicularly, for example on facet 85 is dispersed at the maximum angle of dispersion at the intersection of the facets 84 and 82 so that there is practically no viewing angle, or no position of the gem, in which the gem would not show spectral colors.
  • FIG. 9 shows a finished gem 91 which is set on a mounting plate 92 provided with a fully reflecting coating.
  • a ring 93 is secured for holding the jewel on a finger.
  • Two light rays 94 and 95 are shown to strike the gem 91 and the reflecting surface of mounting plate 92, respectively.
  • Ray 95 passes through gem 91 and is reflected by the same.
  • Ray 94 directly impinges the reflecting surface of plate 92 and is reflected through the gem 91, increasing the sparkle of the same.
  • a person looking at the jewel may perceive on the gem a red area 56, and a blue area 97 in the mirror image of the gem 91 on plate 92, as shown in FIG. 10.
  • a cut ornamental gem consisting of transparent refractive material having a given angle of dispersion and a surface comprising opposite optically cooperating first facets including with each other substantially the angle of dispersion of said material so that first light rays transmitted through the gem and entering the same through one of said first facets are dispersed when passing through the respective other first facet out of the gem, and opposite optically cooperating second facets including with each other substantially half said angle of dispersion so that second light rays entering the gem through one of said second facets are reflected by the respective other second facet and impinge at least one second facet at said angle of dispersion whereby the thus reflected second light rays are dispersed when emerging from the gem; whereby a portion of rays impinging on the gem emerges on and the remaining portion is totally reflected within said gem to thus enhance the color and sparkle thereof.
  • Ornamental gem as defined in claim 1 wherein the angle included between said first facets is between said angle of incidence and an angle which is a few degrees smaller; and wherein the angle included between said second facets is between half said angle of incidence and an angle which is half of said few degrees smaller.
  • Ornamental gem as defined in claim 1 wherein said material is a diamond; wherein said first facets include an angle between and 23 56'; and wherein said second facets include an angle between 10 and 1 1 58'.
  • Ornamental gem as defined in claim 1 wherein said material is a diamond; wherein said first facets include an angle greater than 16 and smaller than 24 30'; and wherein said second facets include an angle greater than 8 and smaller than 12 15'.
  • Ornamental gem as defined in claim 1 wherein said surface has facets arranged in facet rings about the gem, the facets of each facet ring having an odd number and forming a polygon.
  • each of said facet rings has nine facets.
  • facets are located in two adjacent facet rings; wherein the facets of said two facet ringsare staggered and alternate with each other in circumferential direction; and wherein each facet of each facet ring is partly disposed between two facets of the respective other facet ring.
  • Ornamental gem as defined in claim 1 wherein the facets of said opposite facets form facet rings, respectively, about the gem; wherein the number of facets in each facet ring is even; and wherein said facets of said facet rings are staggered.
  • Ornamental gem as defined in claim 1 wherein said gem has a main axis; and wherein said surface is cut asymetrically to said main axis in accordance with the shape of a natural stone blank.
  • Ornamental gem consisting of a transparent refractive material and having a surface comprising optically cooperating opposite facets including with each other angles greater than the critical angle of dispersion and smaller than the critical angle of reflection of said refractive material.

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  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
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US24225A 1969-04-01 1970-03-31 Cut ornamental gem Expired - Lifetime US3665729A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691916643 DE1916643C3 (de) 1969-04-01 1969-04-01 Transparenter Schmuckstein aus natuerlichem oder synthetischem Material,insbesondere bearbeiteter Diamant

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US (1) US3665729A (de)
JP (1) JPS542147B1 (de)
AT (1) AT321010B (de)
BE (1) BE747529A (de)
CA (1) CA941175A (de)
CH (1) CH521728A (de)
DE (1) DE1916643C3 (de)
ES (1) ES378104A1 (de)
FR (1) FR2042156A5 (de)
GB (1) GB1299319A (de)
IE (1) IE33758B1 (de)
IL (1) IL34087A (de)
LU (1) LU60550A1 (de)
NL (1) NL7004257A (de)
SE (1) SE378506B (de)
SU (1) SU449464A3 (de)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083352A (en) * 1977-01-28 1978-04-11 Dmetro Andrychuk Method for cutting ornamental transparent gemstones and products produced therefrom
USD287780S (en) 1983-05-25 1987-01-20 Farber Robert J Candy
US5072549A (en) * 1986-09-22 1991-12-17 Harold Johnston Method of cutting gemstones and product
US5649434A (en) * 1996-01-18 1997-07-22 Ambar Diamonds Inc. Invisible setting for round diamonds
EP0888730A1 (de) * 1997-06-30 1999-01-07 Fitness Innovations & Technology, Inc. Verbesserter Edelstein, ein den Edelstein verbessernder Bausatz sowie ein Verfahren zur Darstellung eines wertvollen Edelsteins
US6406153B1 (en) * 2000-11-10 2002-06-18 Paul R. Stremple Spectral dispersion device
USD467833S1 (en) 2001-08-11 2002-12-31 Joseph Mardkha Mixed cut diamond
US6694778B2 (en) * 2000-08-25 2004-02-24 Hohoemi Brains, Inc. Cut design of diamond for ornamental use
US20040083759A1 (en) * 2002-11-04 2004-05-06 Starcke Steven F. Coatings for gemstones and other decorative objects
US20050069858A1 (en) * 2002-10-15 2005-03-31 Davy Lapa Computer-implemented method of and system for teaching an untrained observer to evaluate a gemstone
US7146827B2 (en) 2001-05-18 2006-12-12 Diamond Innovations, Llc Mixed cut gemstone
US7526928B1 (en) 2002-11-04 2009-05-05 Azotic Coating Technology, Inc. Multi-color gemstones and gemstone coating deposition technology
US20100272627A1 (en) * 2009-04-23 2010-10-28 Chien-Min Sung Multi-Faceted Diamond and Associated Methods
US20110000259A1 (en) * 2007-12-14 2011-01-06 Strnad Iii Leonard J Gemstone and method for cutting the same
AT13397U1 (de) * 2012-07-02 2013-12-15 Swarovski D Kg Schmuckstein mit gewölbtem Rand
US9226554B2 (en) 2014-05-12 2016-01-05 Yoshihiko Kodama Circular cut diamond
US20190350322A1 (en) * 2018-05-15 2019-11-21 Healing Cross LLC Gemstone facet image illumination

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
GB2179236A (en) * 1985-08-20 1987-03-04 Steven John Hathaway Jewellery stone mounting
GB2227402B (en) * 1989-01-26 1992-02-19 M Vainer Limited Improvements in or relating to gemstones
GB2286760A (en) * 1994-02-17 1995-08-30 Atomic Energy Authority Uk Colouration of gemstones
BE1013545A3 (nl) * 2000-06-09 2002-03-05 Tolkowsky Gabriel S Siersteen.
JP6807839B2 (ja) 2014-12-02 2021-01-06 カルティエ インターナショナル アーゲー 宝石、特にはファセットダイヤモンド、およびそれを台に取り付ける方法

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US712155A (en) * 1902-04-02 1902-10-28 William D Seddon Diamond-cutting.
US2340659A (en) * 1943-05-05 1944-02-01 Goldstein Edward Precious stone
US3490250A (en) * 1966-09-19 1970-01-20 Chrom Tronics Inc Enhanced jewel stones and method of forming same
US3528261A (en) * 1968-04-12 1970-09-15 Harry S Jones Doublet gem construction

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CH410498A (de) * 1960-12-13 1966-03-31 Balzers Patent Beteilig Ag Imitationsschmuckstein
DE1230605B (de) * 1964-01-10 1966-12-15 James Huisman Edelstein mit Brillantschliff, insbesondere Diamant
AT242416B (de) * 1964-01-16 1965-09-10 Swarovski & Co Schmuckstein mit Blütenform
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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.
US2340659A (en) * 1943-05-05 1944-02-01 Goldstein Edward Precious stone
US3490250A (en) * 1966-09-19 1970-01-20 Chrom Tronics Inc Enhanced jewel stones and method of forming same
US3528261A (en) * 1968-04-12 1970-09-15 Harry S Jones Doublet gem construction

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083352A (en) * 1977-01-28 1978-04-11 Dmetro Andrychuk Method for cutting ornamental transparent gemstones and products produced therefrom
USD287780S (en) 1983-05-25 1987-01-20 Farber Robert J Candy
US5072549A (en) * 1986-09-22 1991-12-17 Harold Johnston Method of cutting gemstones and product
US5649434A (en) * 1996-01-18 1997-07-22 Ambar Diamonds Inc. Invisible setting for round diamonds
EP0888730A1 (de) * 1997-06-30 1999-01-07 Fitness Innovations & Technology, Inc. Verbesserter Edelstein, ein den Edelstein verbessernder Bausatz sowie ein Verfahren zur Darstellung eines wertvollen Edelsteins
US5981003A (en) * 1997-06-30 1999-11-09 Fitness Innovations & Technologies (F.I.T.), Inc. Gem stone having an enhanced appearance and method of making same
US6694778B2 (en) * 2000-08-25 2004-02-24 Hohoemi Brains, Inc. Cut design of diamond for ornamental use
US6626547B1 (en) 2000-11-10 2003-09-30 Paul R. Stremple Method of using a spectral dispersion device
US6406153B1 (en) * 2000-11-10 2002-06-18 Paul R. Stremple Spectral dispersion device
US7146827B2 (en) 2001-05-18 2006-12-12 Diamond Innovations, Llc Mixed cut gemstone
USD467833S1 (en) 2001-08-11 2002-12-31 Joseph Mardkha Mixed cut diamond
US9678017B2 (en) * 2002-10-15 2017-06-13 Sarine Color Technologies Ltd. System for evaluating a gemstone
US20050069858A1 (en) * 2002-10-15 2005-03-31 Davy Lapa Computer-implemented method of and system for teaching an untrained observer to evaluate a gemstone
US20150022801A1 (en) * 2002-10-15 2015-01-22 Sarine Color Technologies Ltd. Computer-implemented method of and system for teaching an untrained observer to evaluate a gemstone
US8834177B2 (en) 2002-10-15 2014-09-16 Sarine Color Technologies Ltd. Computer-implemented method of and system for teaching an untrained observer to evaluate a gemstone
US8317521B2 (en) * 2002-10-15 2012-11-27 Sarin Color Technologies Ltd. Computer-implemented method of and system for teaching an untrained observer to evaluate a gemstone
US20060065016A1 (en) * 2002-11-04 2006-03-30 Azotic Coating Technology, Inc. Coatings for gemstones and other decorative objects
US20040083759A1 (en) * 2002-11-04 2004-05-06 Starcke Steven F. Coatings for gemstones and other decorative objects
US7137275B2 (en) 2002-11-04 2006-11-21 Azotic Coating Technology, Inc. Coatings for gemstones and other decorative objects
US7526928B1 (en) 2002-11-04 2009-05-05 Azotic Coating Technology, Inc. Multi-color gemstones and gemstone coating deposition technology
US20060068106A1 (en) * 2002-11-04 2006-03-30 Azotic Coating Technology, Inc. Methods for coating gemstones and other decorative objects
US6997014B2 (en) * 2002-11-04 2006-02-14 Azotic Coating Technology, Inc. Coatings for gemstones and other decorative objects
US20110000259A1 (en) * 2007-12-14 2011-01-06 Strnad Iii Leonard J Gemstone and method for cutting the same
US10362843B2 (en) 2007-12-14 2019-07-30 II Leonard J. Strnad Gemstone and method for cutting the same
US20100272627A1 (en) * 2009-04-23 2010-10-28 Chien-Min Sung Multi-Faceted Diamond and Associated Methods
CN101920478A (zh) * 2009-04-23 2010-12-22 宋健民 多面钻石及其相关方法
CN101920478B (zh) * 2009-04-23 2012-07-11 宋健民 制造多面钻石的方法及其宝石级钻石
AT13397U1 (de) * 2012-07-02 2013-12-15 Swarovski D Kg Schmuckstein mit gewölbtem Rand
US9226554B2 (en) 2014-05-12 2016-01-05 Yoshihiko Kodama Circular cut diamond
US20190350322A1 (en) * 2018-05-15 2019-11-21 Healing Cross LLC Gemstone facet image illumination

Also Published As

Publication number Publication date
BE747529A (fr) 1970-08-31
DE1916643C3 (de) 1973-02-01
ES378104A1 (es) 1972-05-16
CH521728A (de) 1972-04-30
FR2042156A5 (de) 1971-02-05
DE1916643B2 (de) 1972-07-06
GB1299319A (en) 1972-12-13
IL34087A0 (en) 1970-05-21
CA941175A (en) 1974-02-05
LU60550A1 (de) 1970-05-21
SE378506B (de) 1975-09-08
AT321010B (de) 1975-03-10
IE33758B1 (en) 1974-10-16
IE33758L (en) 1970-10-01
SU449464A3 (ru) 1974-11-05
IL34087A (en) 1975-03-13
JPS542147B1 (de) 1979-02-02
DE1916643A1 (de) 1970-11-05
NL7004257A (de) 1970-10-05

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