GB1416568A - Method of and apparatus for evaluating registering and identifying gemstones - Google Patents

Method of and apparatus for evaluating registering and identifying gemstones

Info

Publication number
GB1416568A
GB1416568A GB4887673A GB4887673A GB1416568A GB 1416568 A GB1416568 A GB 1416568A GB 4887673 A GB4887673 A GB 4887673A GB 4887673 A GB4887673 A GB 4887673A GB 1416568 A GB1416568 A GB 1416568A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
gemstone
facet
detector
photo
radiation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4887673A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WILSON SS
Original Assignee
Wilson S S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/26Measuring arrangements characterised by the use of optical means for measuring angles or tapers; for testing the alignment of axes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/87Investigating jewels

Abstract

1416568 Gemstone parameter measuring system S S WILSON 19 Oct 1973 [20 Oct 1972] 48876/73 Heading G1A Gemstones are measured, registered and identified by means of a central data processor connected to a plurality of terminals each of which can develop signals representing given parameters of the gemstone. The terminals are connected to the central processor over telephone lines and each contains a weighing station and a dimension and optical parameter measuring device connected to a terminal computer which is also provided with an output printer a CRT display and a typewriter. The dimension and optical parameter measuring device comprises a platform on which the gemstone (exemplified as a brilliant cut diamond) is placed on its table facet. The device is provided with a sequential timer which controls the performance of the following operations. An iris diaphragm (104) is closed round the gemstone to centre it on the platform and to measure its girdle diameter by means of a sensor (109). A probe (114) is lowered into contact with the cullet facet to provide a height measurement by means of a second sensor (117) and the iris is then retracted followed by the probe (114). The platform is then set into rotation. Index facet identification. An infrared laser source 83 is energized to illuminate the gemstone through its table facet the light being internally reflected and refracted in such a way that it emerges from the bezel facets. The platform 39 comprises two sheets of glass sandwiching a reflective layer (128) which reflects the emerging light upwards to a photo-detector array 91 formed as a part conical surface. The array 91 comprises a masking plate having a plurality of slits in ten columns (sectors) of twelve slits arranged so that each slit corresponds to a different position of the reflected beam. Behind each slit is mounted a photo-detector and as the gemstone rotates the highest photo-detector energized in any sector is noted and the facet producing this signal is used as the index facet to which the subsequent measurements are related. The signals from the photodetectors are sequentially scanned to identify which sector and which cells within the sector are illuminated at any instant the signals being passed through a discriminator to eliminate the effects of weak images produced by other facets. Bezel facet angle. The same optical system is then used to determine the angle of each of the bezel facets in turn. As the image of each facet traverses the detector array the position within the sectors of the highest and lowest photo-detectors illuminated are stored in two registers (176, 177) and the position of the sectors containing these detectors are stored in two further registers (182, 183). A coarse value of bezel angle is obtained by subtracting the detector position co-ordinates from one another, dividing by two and adding the position co-ordinate of the lower detector. This value is then corrected for the size of the gemstone by adding a signal which is a function of the previously measured girdle diameter and the resulting value may be offset by the value which would be obtained from a perfect gemstone. A fine connection value is then obtained from the stored sector co-ordinates and is added to produce a measure of the bezel facet angle. Pavilion facet angle. A second layer (84) is then energized to illuminate the top portion of the gemstone from above at an angle close to the vertical and light reflected from the pavilion facets is received by a second photo-detector array 92 constructed in a similar manner to and used in the same way as the first array 91 to determine the pavilion facet angles. Colour. A source 86 is energized to emit IR radiation at a wavelength of 7.8Á which is absorbed to a greater extent by the nitrogen content of the diamond than is the radiation at 0.9Á emitted by source 83 which is also utilized. A chopper 204 periodically interrupts the beam from source 86 and at these times source 83 pulsed at high frequency. The radiation from sources 86 and 83 is therefore directed alternately on to the table facet of the gemstone, emerges from the cullet facet 72 and is received by a detector assembly 93 comprising two photo-detectors in tandem the first detector 208 being more sensitive to 7.8Á radiation and transparent to 0.9Á radiation and the second detector 209 being more sensitive to 0.9Á radiation. The output of the detectors are compared to provide a signal proportional to the nitrogen content and this is normalized by dividing by the height of the gemstone as previously determined to produce a signal representing the colour. The system is calibrated in the absence of a gemstone to produce a zero colour signal. Clarity. A further source (87) illuminates the gemstone from above with a divergent beam centred approximately normal to the pavilion facets so that any flaws scatter light down through the table facet and via a half silvered mirror 248 to a photo-detector 243. The gemstone is rotated and at the same time a radial scan is produced by lateral movement of the assembly 253 carrying mirror 248 and detector 243. The plane within the diamond which is being scanned is selected by an adjustable focus system 251 and by this means the whole volume of the gemstone is scanned and the co-ordinates of any flaws stored. Analogue signals produced in the various measurements are converted to digital form and stored for display and transmission to the central data processor which can be used to register the parameters and record the history of individual stones and identify stolen gemstones.
GB4887673A 1972-10-20 1973-10-19 Method of and apparatus for evaluating registering and identifying gemstones Expired GB1416568A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US29934372 true 1972-10-20 1972-10-20

Publications (1)

Publication Number Publication Date
GB1416568A true true GB1416568A (en) 1975-12-03

Family

ID=23154378

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4887673A Expired GB1416568A (en) 1972-10-20 1973-10-19 Method of and apparatus for evaluating registering and identifying gemstones

Country Status (1)

Country Link
GB (1) GB1416568A (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007809A1 (en) * 1978-07-28 1980-02-06 Gem Instruments Corporation Apparatus for producing a simulated visual image of a selected gemstone
EP0041391A1 (en) * 1980-06-04 1981-12-09 Gersan Establishment Method and system for examining a gem stone
EP0042361A1 (en) * 1980-06-17 1981-12-23 GRETAG Aktiengesellschaft Method and device for machine identification of gem stones
WO1987003963A1 (en) * 1985-12-19 1987-07-02 The British Petroleum Company P.L.C. Method for assessing diamond quality
EP0256196A1 (en) * 1986-08-13 1988-02-24 Artika International (Hong-Kong) Limited Method to identify a certain object and to recognize it afterwards
US4907875A (en) * 1987-01-16 1990-03-13 The British Petroleum Company P.L.C. Diamond separation process
US4946045A (en) * 1985-12-20 1990-08-07 Ditchburn Robert W Sorting
US5076698A (en) * 1988-11-09 1991-12-31 Anstalt Gersan Sensing the shape of an object
US5184732A (en) * 1985-12-20 1993-02-09 Gersan Establishment Shape sorting
US5206699A (en) * 1988-05-06 1993-04-27 Gersan Establishment Sensing a narrow frequency band of radiation and gemstones
WO1993012496A1 (en) * 1991-12-09 1993-06-24 Gem International Network, Inc. Computer imaging system for gemstones
WO1994029680A1 (en) * 1993-06-14 1994-12-22 Bernard David Shindler Jewellery gauge
EP0710383A1 (en) * 1993-06-10 1996-05-08 Verification Technologies, Inc. System for registration, identification, and authentication of items
US5835200A (en) * 1990-04-24 1998-11-10 Gersan Establishment Method and apparatus for examining an object
WO1999034197A1 (en) * 1997-12-24 1999-07-08 Gersan Establishment Examining diamonds and gemstones
US5932119A (en) 1996-01-05 1999-08-03 Lazare Kaplan International, Inc. Laser marking system
EP1211503A1 (en) * 2000-12-04 2002-06-05 Diamcad A method and apparatus for locating inclusions in a diamond stone
WO2003099054A2 (en) * 2002-05-29 2003-12-04 Malcolm Raymond Warwick Method and apparatus for identifying gemstones
US7251619B2 (en) * 2000-09-01 2007-07-31 Garry Ian Holloway Computer implemented method, computer program product, and system for gem evaluation
US7259839B2 (en) 2003-06-06 2007-08-21 Garry Ian Holloway Method and apparatus for examining a diamond
EP2362180A1 (en) * 2010-02-05 2011-08-31 Poly-clip System GmbH & Co. KG Method for measuring a storage frame
WO2011122989A1 (en) * 2010-03-29 2011-10-06 Nizienko Yuri Konstantinovich Method for positioning and detecting an invisible mark and detector for implementing same
CN102749331A (en) * 2011-04-20 2012-10-24 捷迈克斯系统公司 Gemstone positioning and analysis system
WO2016185472A1 (en) * 2015-05-21 2016-11-24 Sarine Color Technologies Ltd. System and method of unique identifying a gemstone

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007809A1 (en) * 1978-07-28 1980-02-06 Gem Instruments Corporation Apparatus for producing a simulated visual image of a selected gemstone
EP0041391A1 (en) * 1980-06-04 1981-12-09 Gersan Establishment Method and system for examining a gem stone
EP0042361A1 (en) * 1980-06-17 1981-12-23 GRETAG Aktiengesellschaft Method and device for machine identification of gem stones
WO1987003963A1 (en) * 1985-12-19 1987-07-02 The British Petroleum Company P.L.C. Method for assessing diamond quality
US4875771A (en) * 1985-12-19 1989-10-24 The British Petroleum Company P.L.C. Method for assessing diamond quality
US4946045A (en) * 1985-12-20 1990-08-07 Ditchburn Robert W Sorting
US5184732A (en) * 1985-12-20 1993-02-09 Gersan Establishment Shape sorting
EP0256196A1 (en) * 1986-08-13 1988-02-24 Artika International (Hong-Kong) Limited Method to identify a certain object and to recognize it afterwards
US4907875A (en) * 1987-01-16 1990-03-13 The British Petroleum Company P.L.C. Diamond separation process
US5206699A (en) * 1988-05-06 1993-04-27 Gersan Establishment Sensing a narrow frequency band of radiation and gemstones
US5076698A (en) * 1988-11-09 1991-12-31 Anstalt Gersan Sensing the shape of an object
US5835200A (en) * 1990-04-24 1998-11-10 Gersan Establishment Method and apparatus for examining an object
WO1993012496A1 (en) * 1991-12-09 1993-06-24 Gem International Network, Inc. Computer imaging system for gemstones
EP0710383A1 (en) * 1993-06-10 1996-05-08 Verification Technologies, Inc. System for registration, identification, and authentication of items
EP0710383A4 (en) * 1993-06-10 1998-01-14 Verification Technologies Inc System for registration, identification, and authentication of items
WO1994029680A1 (en) * 1993-06-14 1994-12-22 Bernard David Shindler Jewellery gauge
US6476351B1 (en) 1996-01-05 2002-11-05 Lazare Kaplan International, Inc. Laser marking system
EP2216126A2 (en) 1996-01-05 2010-08-11 Lazare Kaplan International Inc. Laser marking system for gemstones and method of authenticating marking
US6211484B1 (en) 1996-01-05 2001-04-03 Lazare Kaplan International, Inc. Laser making system and certificate for a gemstone
US5932119A (en) 1996-01-05 1999-08-03 Lazare Kaplan International, Inc. Laser marking system
WO1999034197A1 (en) * 1997-12-24 1999-07-08 Gersan Establishment Examining diamonds and gemstones
US7251619B2 (en) * 2000-09-01 2007-07-31 Garry Ian Holloway Computer implemented method, computer program product, and system for gem evaluation
EP1211503A1 (en) * 2000-12-04 2002-06-05 Diamcad A method and apparatus for locating inclusions in a diamond stone
WO2002046725A1 (en) * 2000-12-04 2002-06-13 Diamcad N.V. Method and apparatus for locating inclusions in a diamond
WO2003099054A2 (en) * 2002-05-29 2003-12-04 Malcolm Raymond Warwick Method and apparatus for identifying gemstones
WO2003099054A3 (en) * 2002-05-29 2004-04-22 Malcolm Raymond Warwick Method and apparatus for identifying gemstones
US7259839B2 (en) 2003-06-06 2007-08-21 Garry Ian Holloway Method and apparatus for examining a diamond
US9285210B2 (en) 2010-02-05 2016-03-15 Poly-Clip System Gmbh & Co. Kg Method for measuring a storage frame
EP2362180A1 (en) * 2010-02-05 2011-08-31 Poly-clip System GmbH & Co. KG Method for measuring a storage frame
CN102906562A (en) * 2010-03-29 2013-01-30 尤里康斯坦廷诺维奇·尼奇恩科 Method for positioning and detecting invisible mark and detector for implementing same
WO2011122989A1 (en) * 2010-03-29 2011-10-06 Nizienko Yuri Konstantinovich Method for positioning and detecting an invisible mark and detector for implementing same
CN102749331A (en) * 2011-04-20 2012-10-24 捷迈克斯系统公司 Gemstone positioning and analysis system
BE1020081A5 (en) * 2011-04-20 2013-04-02 Gemex Systems Inc Gemstone Positioning and analysis.
GB2490187B (en) * 2011-04-20 2017-06-21 Gemex Systems Inc Gem Positioning and analysis system
WO2016185472A1 (en) * 2015-05-21 2016-11-24 Sarine Color Technologies Ltd. System and method of unique identifying a gemstone

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee