US3740142A - Apparatus for discriminating and/or identifying jewels - Google Patents

Apparatus for discriminating and/or identifying jewels Download PDF

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Publication number
US3740142A
US3740142A US00046724A US3740142DA US3740142A US 3740142 A US3740142 A US 3740142A US 00046724 A US00046724 A US 00046724A US 3740142D A US3740142D A US 3740142DA US 3740142 A US3740142 A US 3740142A
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United States
Prior art keywords
jewel
enclosure
light
holding
holding means
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Expired - Lifetime
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US00046724A
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English (en)
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Y Takubo
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FUMIO SURUKI
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FUMIO SURUKI
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/87—Investigating jewels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/389—Precious stones; Pearls
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor

Definitions

  • the ap paratus comprises an enclosure forming a dark room in Cl- I the material Such as a jewel IS tested, means for holding and positioning the material at a selected posi- [5 l] Int. Cl. G0l n l 3 inside Ofthe dark room a beam Ofelectromagnetic 581 Field of 356/30 76 31 radiation Such as light is directed the material preferably from the culet side of the material, and a photographic material preferably placed on the crown [56] References Cited UNITED STATES PATENTS 12/1964 Chan...........t....
  • the materials having optical properties such as jewels can be discriminated or identified employing crystallographical techniques.
  • the material such as jewels may be tested employing X-rays, ultraviolet rays, or polarized light, and the reflected, refracted, or dispersed rays or visible light may be recorded on a photographic substance or film for the subsequent inspection.
  • X-rays ultraviolet rays
  • polarized light the reflected, refracted, or dispersed rays or visible light
  • such a procedure is carried out rather for determining the kind of the materials or for determining the crystallographical structure, and the method and devices required for practicing such a procedure are too much complicated and costly for simply discriminating or identifying the material in the commercial basis.
  • the primary object of the present invention is to provide a novel method and device for testing materials having optical properties such as jewels for the purpose of mostly discrimination and identification of the materials in a commercial basis.
  • Another object of the present invention is to provide a novel method and device for testing materials having optical properties without relying on the craftmans skill or experiences.
  • Still another object of the present invention is to provide a novel method and device for testing materials having optical properties such as transparency, reflection, and refraction without requiring any elaborate procedure or devices.
  • Still another object of the present invention is to provide a novel method and device for testing materials such as jewels whereby a visible record indicative of any slight degree of difference inherent in the material is obtained for preservation and subsequent comparison.
  • a further object of the present invention is to provide a novel method and device for testing materials such as jewels wherein the material to be tested can be instan taneously set to the position, and a record can be obtained even if the material is mounted on a ring or the like ornament.
  • a yet further object of the present invention is to provide a novel apparatus for testing materials such as jewels, wherein all of the required components are combined in one unit, whereby a visible record of the material can be obtained instantaneously.
  • the material preferably of light rays in a range of wavelength reflectable and refractable by the material, onto the material such as a jewel; and recording, on a photographic mate rial, an image of distribution of the electromagnetic radiation beam passed through on the material.
  • the photographic material such as a photographic film may be placed on the crown side of the jewel having a plurality of facets, and the electromagnetic radiation beam such as light rays may be shone on the jewel from the culet side thereof.
  • the photographic material is a Polaroid film which can be instantaneously developed and printed, and the electromagnetic radiation beam is obtained from a miniature lamp of a known characteristic.
  • the above described objects are also achieved by a novel device for testing materials such as jewels having a plurality of facets, the device comprising an enclosure forming a dark room, means for holding and positioning the material inside of said enclosure, a source of electromag netic radiation beam directed onto the material to be tested, and a photographic material for recording an image of the electromagnetic radiation distribution of the beam passed through the material.
  • the above mentioned means for holding and positioning the material to be tested is made adjustable as to the position from the outside of the enclosure.
  • the above mentioned means for holding and positioning the material is made into a fixed type, and a separate focusing means controllable from the outside of the enclosure may be provided inside of the enclosure.
  • a shutter system for rendering an ade quate exposure time on the photographic material be provided inside of the enclosure, and a shutter button may be provided on the front panel of the enclosure.
  • the photographic material such as a photographic film is preferably placed on the crown side of the jewel having a plurality of facets, and the electromagnetic radiation beam is preferably shone onto the jewel from the culet side thereof.
  • the above described beam electromagnetic radiation source may be made in the form of a miniaturized lamp attached on an end of the positioning device for the material in a manner aligning with the material, so that the light beam from the miniature lamp is shone on the jewel.
  • FIG. 1 is a schematic diagram to be employed for explaining the fundamental principle of the present invention
  • FIG. 2 is a diagram showing a distribution of reflected or refracted light beams obtained by a device schematically indicated in FIG. 1;
  • FIG. 3 is another schematic diagram to be employed for explaining the fundamental principle of the present invention.
  • FIG. 4 is also a diagram showing another distribution of reflected or refracted light beams obtained by a device schematically indicated in FIG. 3;
  • FIG. 5 is a perspective view of an apparatus which constitutes an embodiment of the present invention.
  • FIG. 6 is also a perspective view showing the same apparatus illustrated in FIG. 5, which is partly frustrated so that the inside components can be seen more clearly;
  • FIG. 7 is another perspective view showing a construction of a jewel positioning head employed in the apparatus shown in FIGS. 5 and 6;
  • FIG. 8 is a partial sectional view showing an apparatus which constitutes another embodiment of the present invention.
  • FIG. 9 is a sectional view rather schematically showing another construction of the jewel holding and positioning device which also may be employed in an apparatus according to the present invention.
  • FIG. 1 showing an example of a device for practicing the method according to the present invention for the purpose of explanation of the fundamental principle of the invention, there is indicated a cylindrical body 1 having a top cover 2 and a bottom plate 3 so that a dark room is thereby formed.
  • a transparent plate 4 having a glassy surface to mount a jewel A is provided inside of the cylindrical body 1.
  • a source of an electromagnetic radiation which is a visible light in this example, is formed into a unit 5 including a lamp 6, a condenser lens 7, and a small hole 8 for passing a light beam.
  • the light source 5 is provided through the top cover 2 so that a light beam Fl is shone onto the jewel A fixed on a jewel mounting piece 9 placed on the transparent plate 4.
  • a photographic material such as a film is provided on the inside surface of the cylindrical body 1, and the light rays reflected or refracted from the jewel A are projected on the film 10 as indicated by arrows F-2 through F-7.
  • a plurality of images for the reflected or refracted light rays through the jewel A are formed on the film 10. If the film 10 is thereafter withdrawn and developed, images such as illustrated in FIG. 2 are fixed on the film 10, so that the film may be preserved for the subsequent comparison for the identification or discrimination of the jewel.
  • FIG. 3 all of the members such as the cylindrical dark room 1, a transparent plate 4 having a glassy surface, and a light source 5 having a lamp 6, a condenser lens 7, and a small hole 8 are quite similar to those indicated in FIG. 1.
  • the jewel A is placed directly on the transparent plate 4, with the crown directed downward contacting with the transparent plate 4, so that the light beam F-l passing through the hole 8 of the light source unit 5 is shone on the culet side of the jewel A.
  • the photographic materials such as films are attached not only on the inside surface of the cylindrical body 1 but also on the inside surface of the bottom plate 3.
  • the light beam is preferably, but not limited thereto, shone on the jewel from the culet side of the jewel.
  • an electromagnetic radiation in the form of visible light rays, has been employed for the simplicity of the explanation, another form of electromagnetic radiation such as infrared rays or ultraviolet rays may also be employed for a specific field of application, so far as the rays may be reflected or refracted by the facets of the jewels.
  • an enclosure or casing generally indicated by a reference numeral 10.
  • a position adjusting knob 13 for the material such as ajewel
  • a voltage adjusting knob 14 for the light source for the light source
  • a power switch 15 for energizing the lighting system for the energization of the system
  • an indicating light 16 for the energization of the system and a shutter push-button 17 for photographing the image reflected or refracted from the material to be tested are provided.
  • a recessed portion generally indicated by a numeral 18 is provided.
  • a viewer having a hood 20 and a focusing glass 21 as shown in FIG. 6 or a pack of photographic films (not shown) may be inserted in the recessed portion 18, and may be fixed in the position by means of snapping projections 19.
  • the rearward portion 12 of the casing 10 may also be constructed in such a manner that it adapts to receive the viewer having a hood 20 and a focusing glass 21 and/or a package of the Polaroid films which may be fixed in the position by means of a stopper 22 as shown in FIG. 6.
  • a jewel positioning device comprising, for instance, a positioning arm 30, a head 31, and a screw-threaded shaft 32.
  • the above-mentioned jewel position adjusting knob 13 is attached on one end of the screw-threaded shaft 32, the other end of which is received rotatably in a recessed pad 33 fixed to the bottom plate of the casing 10.
  • the screw threaded on the shaft 32 engages the female screw threaded inside of a hole provided at one end of the jewel position adjusting arm 30, so that when the knob 13 is rotated in either of the directions, the entirety of the jewel positioning device is raised or lowered relative to the focusing glass or the surface of the photographing film.
  • a jewel positioning head 31 is detachably fixed, for instance, by means of machine screws (not shown).
  • the jewel positioning head 31 may take various forms or construction in accordance with the requirements and ornaments bearing the jewel. Accordingly, it should be understood that the positioning head 31 shown in FIG. 6 is a typical one adapted for mounting a ring 2 embedded by the jewel 1 and having a hole through which a light beam may pass through the ring to the culet side of the jewel l.
  • a miniature lamp 35 is included inside of the jewel positioning head 31 at a position aligning the central axis of the jewel 1 embedded in the ring 2.
  • the jewel positioning head 31 comprises, beside of the main body, a ring supporting member 36 having a ring stopper 36a, and a machine screw having a knob 37 for adjusting the position of the ring supporting member 36 to suit to the size of the ring 2 bearing the jewel 1.
  • the above mentioned miniature lamp 35 is included inside of a chamber (not shown) formed at one end of the jewel positioning head 31, and is covered by a covering piece 34 having a central hole 34a and detachably mounted on the positioning head 31.
  • the central hole 34a of the covering piece 34 is so formed that it may be easily abutted in alignment with the aforementioned hole provided through the ring 2 just under the position wherein the jewel 1 is embedded or supported.
  • An electric power system including a voltage adjusting means is included in the device for lighting the above mentioned miniature lamp 35, and energized or deenergized by means of the above described power switch 15, with such a condition being indicated by the indicator light 16, both mounted on the front panel 11 of the casing 10.
  • the voltage adjusting means may be constructed in the form of a transformer T included inside of the casing as shown in FIG. 6, and the output voltage of the transformer may be adjusted by the voltage adjusting knob 14.
  • the device may also include a shutter system rendering an adequate period of exposure on the photographic material such as a film, although such shutter system is not indicated in the drawings because it constitutes no part of the present invention, and the operation of the shutter system may be controlled by the shutter button 17 provided on the front panel 1 1 of the casing 10.
  • the shutter system may take a form of an electric timer for supplying a pulse current to the lamp 35 if an adequate consideration is paid as to the intensity of the current and the period for the duration of the current.
  • FIG. 8 there is indicated a cross-sectional view of a device for discriminating and identifying materials having optical properties such as jewels, which constitutes another embodiment of the present invention.
  • a device for discriminating and identifying materials having optical properties such as jewels
  • the focusing of the image of the jewel on the focusing glass 21 or on the surface of the photographic film is achieved by a focusing lens system including focusing lenses 40, and a lens supporting arm 41 which is engaging with the screw threaded shaft 32 controlled by a knob 13, acting at this time as a focusing knob.
  • a focusing lens system including focusing lenses 40, and a lens supporting arm 41 which is engaging with the screw threaded shaft 32 controlled by a knob 13, acting at this time as a focusing knob.
  • the jewel mounting unit has a jewel mounting main body 50 the lower end of which is detachably fixed to a mounting socket 51.
  • the upper end of the main body 50 is preferably bent at right-angle, as indicated in FIG. 8, and a lamp accommodating chamber having a cover 53 is provided at an end portion thus bent perpendicularly.
  • the cover 53 is detachably mounted over the lamp 35 mounted on a socket provided at the bottom of the chamber, and a chamfered or a stepped hole 53a is cut through the cover 53.
  • a rubber ring 54 having a central hole of a substantially equivalent diameter to the narrower diameter of the stepped hole 53a is inserted into the larger diameter portion of the stepped hole 53a, so that a resilient touch against the inside surface of the ring 2 may be obtained.
  • a ring supporting pad 52 is slidably supported, so that the position of the pad 52 may be adjusted for a desired size of the ring 2 by manipulating a projected end portion 52a of the ring supporting pad 52.
  • the lamp 35 and the hole through the cover 53 and the rubber ring 54 are aligned with a hole through the ring 2 just under the jewel 1, so that a light beam may be projected to the culet side of the jewel 1.
  • FIG. 9 Still another embodiment of the jewel positioning device which is employable in the device for identifying or discriminating the jewl is indicated in FIG. 9 rather schematically and as a sectional view taken along the axis of the assembly.
  • This jewel positioning device is intended for positioning the jewel l which is not mounted on a ring.
  • the jewel clamping unit 60 comprises a required number of claws 61 for holding the jewel 1, a cylindrical member 62 joined to the lower ends of the claws 61 and a mounting screw thread is cut on the lower surface thereof, a sleeve 63 slipped over the cylindrical member 62 and having stepped inside holes of larger and a smaller diameter, and a coiled spring 64 slipped over the cylindrical member 62 so that the upper end of the coiled spring 64 abuts the stepped annular surface inside of the sleeve 63.
  • the screw threaded portion near the lower end of the cylindrical member 62 is driven into a mating hole provided in a mounting member 65 of the jewel clamping unit which is detachably coupled to a hoisting and descending member 66.
  • the hoisting and descending member 66 may have any cross-sectional configuration, but preferably rectangular, and a collar 66a for limiting the upward movement thereof is provided on the surface at an intermediate position along the length.
  • a rack 66b and a pinion 67 are provided on one side surface of the member 66 below the collar 66a.
  • the hoisting and descending member 66 is passed through a mating opening provided through a fixed member 70.
  • a miniature lamp 35 is accommodated in the cylindrical member 62 and an electrical power system is connected to the lamp 35.
  • the jewel 1 may firstly be inserted between the claws 61, 61 of the jewel clamping unit 60 when the sleeve 63 is pushed down against the resilience of the coiled spring 64 and the claws 61, 61 are separated outwardly by their own resilience.
  • the jewel 1 is firmly clamped by the claws 61, 61 which are compressed by means of the sleeve 63 pushed upwards under the resilience of the coiled spring 64.
  • the hoisting and descending member 66 is hoisted or descended under the action of the pinion 67 and the rack 66b, the pinion 67 being rotated through any of the conventional means from the jewel positioning knob (not shown), so that a sharp image of the reflected or refracted light spots may be obtained on the focusing plane 21.
  • the arrangement of the jewel positioning or focusing knob, the voltage adjusting knob, or the like provided on the front panel of the device may be utterly changed from those indicated and described in this invention, or even the front panel itself may be eliminated, and the required controlling knobs or the like may be arranged on a side panel or any other suitable positions.
  • the jewel positioning unit has been described as merely adjustable of the vertical position of the jewel, it may also be modified so that the jewel may be turned around of the axis at a desired angle.
  • An apparatus for discriminating and identifying materials having optical properties which comprises:
  • a light-proof enclosure having side walls and a bottom portion and having located therein, holding means for holding and positioning the material, said holding means including a transparent plate supported by the side walls of the lightproof enclosure:
  • a light source a beam of which is directed onto the material to be tested
  • a photographic material for recording an image of the spectral light distribution of the beam passed through the material, held in place along the walls of the light-proof enclosure by said holding means and disposed along the bottom of the light-proof enclosure.
  • An apparatus according to claim 3 and further including control means positioned outside said enclosure and connected to said holding means for adjusting said holding means from outside said enclosure.
  • a shining time of the light source can be adjusted from the outside of the enclosure, said shining time being instantaneously a time of exposure to record a specific character of the spectral light passed through the jewel on a photographic material.

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  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Adornments (AREA)
  • Microscoopes, Condenser (AREA)
  • Length Measuring Devices By Optical Means (AREA)
US00046724A 1969-08-24 1970-06-16 Apparatus for discriminating and/or identifying jewels Expired - Lifetime US3740142A (en)

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Application Number Priority Date Filing Date Title
JP1969080406U JPS5015597Y1 (sv) 1969-08-24 1969-08-24

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US (1) US3740142A (sv)
JP (1) JPS5015597Y1 (sv)
BE (1) BE752563A (sv)
DE (2) DE2031065A1 (sv)
FR (1) FR2062134A5 (sv)
GB (1) GB1301537A (sv)
IL (1) IL34748A (sv)
NL (1) NL147858B (sv)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867032A (en) * 1973-03-20 1975-02-18 Diharo Diamanten Handels Compa Arrangement for objectively evaluating characteristics of gems, particularly diamonds
US3947120A (en) * 1973-10-23 1976-03-30 Yeda Research And Development Co. Ltd. Gem identification
US3985454A (en) * 1975-03-14 1976-10-12 Nasa Window defect planar mapping technique
US4763986A (en) * 1986-11-24 1988-08-16 Sego Marvin A Illuminated jeweler's loupe
EP0412168A1 (en) * 1989-02-17 1991-02-13 Yamashita, Masayo Instrument for inspecting brilliance of jewels such as diamond and photographing of jewels therewith
EP0442065A2 (en) * 1990-02-15 1991-08-21 Kinsaku Yamashita Instrument for observing jewels brilliance as diamond, and method of taking photographs with said instrument
EP0464824A2 (en) * 1990-07-06 1992-01-08 Kinsaku Yamashita Method and implement for observing or photographing GEM such as diamond
WO1995011447A1 (en) * 1993-10-18 1995-04-27 Hanna Can Gem viewing and manipulation apparatus
WO1997004303A1 (en) * 1995-07-24 1997-02-06 Gersan Establishment Examining a diamond
GB2317693A (en) * 1995-07-24 1998-04-01 Gersan Ets Examining a diamond
US5835205A (en) * 1996-02-12 1998-11-10 C3, Inc. Optical testing system for distinguishing a silicon carbide gemstone from a diamond
US6308891B1 (en) 1999-05-05 2001-10-30 T.I.D. (The Identifying Diamond) Inc. Jewelry identification
US6450402B1 (en) 1999-05-05 2002-09-17 T.I.D. (The Identifying Diamond) Inc. Identification device
US20040195114A1 (en) * 2003-04-03 2004-10-07 Lau Anson W. Jewelry box with a viewer
US20060244946A1 (en) * 2005-05-02 2006-11-02 William Underwood Apparatus for grading gemstone cut and symmetry and a method for using the same
US20080041734A1 (en) * 2005-09-22 2008-02-21 Bergelson Alan P Jewelry display apparatus
BE1021617B1 (nl) * 2013-01-23 2015-12-18 Osmana, Besloten Vennootschap Met Beperkte Aansprakelijkheid Inrichting voor het bekijken van juwelen
WO2016022153A1 (en) * 2014-08-08 2016-02-11 Empire Technology Deveplopment Llc Spectroscopic determination of optical properties of gemstones
WO2016185472A1 (en) 2015-05-21 2016-11-24 Sarine Color Technologies Ltd. System and method of unique identifying a gemstone
WO2017212238A1 (en) * 2016-06-06 2017-12-14 De Beers Uk Limited Gemstone viewer
GB2603820A (en) * 2021-02-10 2022-08-17 John Mepham Tony Gemmology spectrum absorption light enhancer for spectroscope

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120268728A1 (en) * 2011-04-20 2012-10-25 GemEx Systems, Inc., a Wisconsin corporation Gem positioning and analysis system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1700497A (en) * 1927-04-28 1929-01-29 Heitzler Frank Apparatus for use in identifying precious stones
US2742813A (en) * 1952-10-17 1956-04-24 Zeininger Henry Percy Projection apparatus for displaying precious stones
SU122613A1 (ru) * 1958-05-14 1958-11-30 С.А. Бородин Фотогониометр
US3160748A (en) * 1962-06-28 1964-12-08 Frank L Chan Spherical goniometer head and adapter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1700497A (en) * 1927-04-28 1929-01-29 Heitzler Frank Apparatus for use in identifying precious stones
US2742813A (en) * 1952-10-17 1956-04-24 Zeininger Henry Percy Projection apparatus for displaying precious stones
SU122613A1 (ru) * 1958-05-14 1958-11-30 С.А. Бородин Фотогониометр
US3160748A (en) * 1962-06-28 1964-12-08 Frank L Chan Spherical goniometer head and adapter

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867032A (en) * 1973-03-20 1975-02-18 Diharo Diamanten Handels Compa Arrangement for objectively evaluating characteristics of gems, particularly diamonds
US3947120A (en) * 1973-10-23 1976-03-30 Yeda Research And Development Co. Ltd. Gem identification
US3985454A (en) * 1975-03-14 1976-10-12 Nasa Window defect planar mapping technique
US4763986A (en) * 1986-11-24 1988-08-16 Sego Marvin A Illuminated jeweler's loupe
US5260763A (en) * 1989-02-17 1993-11-09 Masayo Yamashita Instrument for observing jewels' brilliance as diamond, and method of taking photographs with said instrument
EP0412168A1 (en) * 1989-02-17 1991-02-13 Yamashita, Masayo Instrument for inspecting brilliance of jewels such as diamond and photographing of jewels therewith
EP0412168B1 (en) * 1989-02-17 1997-07-23 Kinsaku Yamashita Instrument for inspecting brilliance of jewels such as diamond and photographing of jewels therewith
EP0442065A2 (en) * 1990-02-15 1991-08-21 Kinsaku Yamashita Instrument for observing jewels brilliance as diamond, and method of taking photographs with said instrument
EP0442065B1 (en) * 1990-02-15 1997-07-23 Kinsaku Yamashita Instrument for observing jewels brilliance as diamond, and method of taking photographs with said instrument
US5196966A (en) * 1990-07-06 1993-03-23 Masayo Yamashita Method and implement for observing or photographing gem such as diamond
AU656728B2 (en) * 1990-07-06 1995-02-16 Kinsaku Yamashita Method and implement for observing or photographing gem such as diamond
EP0464824A3 (en) * 1990-07-06 1992-01-22 Kinsaku Yamashita Method and implement for observing or photographing gem such as diamond
EP0464824A2 (en) * 1990-07-06 1992-01-08 Kinsaku Yamashita Method and implement for observing or photographing GEM such as diamond
WO1995011447A1 (en) * 1993-10-18 1995-04-27 Hanna Can Gem viewing and manipulation apparatus
WO1997004303A1 (en) * 1995-07-24 1997-02-06 Gersan Establishment Examining a diamond
GB2317693A (en) * 1995-07-24 1998-04-01 Gersan Ets Examining a diamond
GB2317693B (en) * 1995-07-24 1999-10-06 Gersan Ets Examining a diamond
US5835205A (en) * 1996-02-12 1998-11-10 C3, Inc. Optical testing system for distinguishing a silicon carbide gemstone from a diamond
US6308891B1 (en) 1999-05-05 2001-10-30 T.I.D. (The Identifying Diamond) Inc. Jewelry identification
US6450402B1 (en) 1999-05-05 2002-09-17 T.I.D. (The Identifying Diamond) Inc. Identification device
US20040195114A1 (en) * 2003-04-03 2004-10-07 Lau Anson W. Jewelry box with a viewer
US7000760B2 (en) * 2003-04-03 2006-02-21 Lau Anson W Jewelry box with a viewer
US20060244946A1 (en) * 2005-05-02 2006-11-02 William Underwood Apparatus for grading gemstone cut and symmetry and a method for using the same
US7193694B2 (en) 2005-05-02 2007-03-20 William Underwood Method for grading gemstone cut and symmetry
US20080041734A1 (en) * 2005-09-22 2008-02-21 Bergelson Alan P Jewelry display apparatus
BE1021617B1 (nl) * 2013-01-23 2015-12-18 Osmana, Besloten Vennootschap Met Beperkte Aansprakelijkheid Inrichting voor het bekijken van juwelen
EP3177910A4 (en) * 2014-08-08 2018-03-14 Empire Technology Development LLC Spectroscopic determination of optical properties of gemstones
WO2016022153A1 (en) * 2014-08-08 2016-02-11 Empire Technology Deveplopment Llc Spectroscopic determination of optical properties of gemstones
US10054550B2 (en) 2014-08-08 2018-08-21 Empire Technology Development Llc Spectroscopic determination of optical properties of gemstones
WO2016185472A1 (en) 2015-05-21 2016-11-24 Sarine Color Technologies Ltd. System and method of unique identifying a gemstone
US10387723B2 (en) 2015-05-21 2019-08-20 Sarine Color Technologies Ltd. System and method of unique identifying a gemstone
US11017224B2 (en) 2015-05-21 2021-05-25 Sarine Color Technologies Ltd. System and method of unique identifying a gemstone
US11574487B2 (en) 2015-05-21 2023-02-07 Sarine Color Technologies Ltd. System and method of unique identifying a gemstone
US11796480B2 (en) 2015-05-21 2023-10-24 Sarine Color Technologies Ltd. System and method of unique identifying a gemstone
WO2017212238A1 (en) * 2016-06-06 2017-12-14 De Beers Uk Limited Gemstone viewer
GB2603820A (en) * 2021-02-10 2022-08-17 John Mepham Tony Gemmology spectrum absorption light enhancer for spectroscope

Also Published As

Publication number Publication date
JPS5015597Y1 (sv) 1975-05-15
DE2031065A1 (de) 1971-03-04
GB1301537A (sv) 1972-12-29
IL34748A (en) 1973-08-29
NL147858B (nl) 1975-11-17
BE752563A (fr) 1970-12-01
FR2062134A5 (sv) 1971-06-25
IL34748A0 (en) 1970-08-19
DE7023622U (de) 1974-01-03
NL7009528A (sv) 1971-02-26

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