GB2010474A - Gem colour meter - Google Patents

Gem colour meter

Info

Publication number
GB2010474A
GB2010474A GB792027A GB7902027A GB2010474A GB 2010474 A GB2010474 A GB 2010474A GB 792027 A GB792027 A GB 792027A GB 7902027 A GB7902027 A GB 7902027A GB 2010474 A GB2010474 A GB 2010474A
Authority
GB
United Kingdom
Prior art keywords
colour
stone
gem
light
detector
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.)
Withdrawn
Application number
GB792027A
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB792027A priority Critical patent/GB2010474A/en
Publication of GB2010474A publication Critical patent/GB2010474A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0218—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using optical fibers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • 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
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

An apparatus for determining or classifying the "colour" of a gem stone 13 comprises a source 14, a filter wheel 19 and a photomultiplier 22 for analysing the light passing through the stone in at least two different colour bands (typically red and blue). In another constructional arrangement, Fig. 7 (not shown) the stone is mounted in a hemispherical reflector having input and output of light by light guides. The detector circuit has channels for each colour and means for obtaining difference values therebetween and means for utilising the sum of all channel signals to adjust the gain of the detector. <IMAGE>
GB792027A 1977-10-19 1979-01-19 Gem colour meter Withdrawn GB2010474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB792027A GB2010474A (en) 1977-10-19 1979-01-19 Gem colour meter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4347077 1977-10-19
GB792027A GB2010474A (en) 1977-10-19 1979-01-19 Gem colour meter

Publications (1)

Publication Number Publication Date
GB2010474A true GB2010474A (en) 1979-06-27

Family

ID=26265159

Family Applications (1)

Application Number Title Priority Date Filing Date
GB792027A Withdrawn GB2010474A (en) 1977-10-19 1979-01-19 Gem colour meter

Country Status (1)

Country Link
GB (1) GB2010474A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259011A (en) * 1979-11-05 1981-03-31 Crumm John C Optical gem analyzer
EP0041348A2 (en) * 1980-06-04 1981-12-09 De Beers Consolidated Mines Limited A method of assessing the colour in diamonds and other gems
US4645922A (en) * 1984-10-05 1987-02-24 Spandrel Establishment Integrating sphere arrangement for producing size-corrected color signals
WO1988005534A1 (en) * 1987-01-16 1988-07-28 The British Petroleum Company P.L.C. Separation process for diamonds
EP0301329A2 (en) * 1987-07-31 1989-02-01 Roggero, Paolo Lighting installation for spectroscopic observation of minerals, juwels, or equivalent
US4875771A (en) * 1985-12-19 1989-10-24 The British Petroleum Company P.L.C. Method for assessing diamond quality
EP0458223A2 (en) * 1990-05-23 1991-11-27 Firma Carl Zeiss Apparatus for measuring the absorption of transparent probes having an unfavourable form
BE1006575A3 (en) * 1992-12-18 1994-10-18 Taiko Co Ltd ENLARGEMENT DEVICE FOR PRECIOUS STONES HAVING CUT FACETS THAT ARE MADE IN IT.
DE19610393A1 (en) * 1996-03-16 1997-09-18 J & M Analytische Mess & Regeltechnik Gmbh Identification and/or classification of precious stones using light spectrometer
US5835200A (en) * 1990-04-24 1998-11-10 Gersan Establishment Method and apparatus for examining an object
US5932119A (en) 1996-01-05 1999-08-03 Lazare Kaplan International, Inc. Laser marking system
US6473164B1 (en) 2000-02-16 2002-10-29 Gemological Institute Of America, Inc. Systems, apparatuses and methods for diamond color measurement and analysis
US7834987B2 (en) 2000-10-12 2010-11-16 Gemological Institute Of America, Inc. Systems and methods for evaluating the appearance of a gemstone
USRE44963E1 (en) 1997-01-10 2014-06-24 Diamond Technologies, Inc. System and method for computerized evaluation of gemstones
IT202100021218A1 (en) * 2021-08-05 2023-02-05 Diamsafe S R L METHOD AND DEVICE FOR UNIQUELY IDENTIFYING A FACETED GEMSTONE

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259011A (en) * 1979-11-05 1981-03-31 Crumm John C Optical gem analyzer
EP0041348A2 (en) * 1980-06-04 1981-12-09 De Beers Consolidated Mines Limited A method of assessing the colour in diamonds and other gems
EP0041348A3 (en) * 1980-06-04 1982-03-31 De Beers Consolidated Mines Limited A method of assessing the colour in diamonds and other gems and a set of diamonds or other gems graded by the method
US4645922A (en) * 1984-10-05 1987-02-24 Spandrel Establishment Integrating sphere arrangement for producing size-corrected color signals
US4875771A (en) * 1985-12-19 1989-10-24 The British Petroleum Company P.L.C. Method for assessing diamond quality
WO1988005534A1 (en) * 1987-01-16 1988-07-28 The British Petroleum Company P.L.C. Separation process for diamonds
US4907875A (en) * 1987-01-16 1990-03-13 The British Petroleum Company P.L.C. Diamond separation process
EP0301329A2 (en) * 1987-07-31 1989-02-01 Roggero, Paolo Lighting installation for spectroscopic observation of minerals, juwels, or equivalent
EP0301329A3 (en) * 1987-07-31 1990-08-01 Roggero, Paolo Lighting installation for spectroscopic observation of minerals, juwels, or equivalent
US5835200A (en) * 1990-04-24 1998-11-10 Gersan Establishment Method and apparatus for examining an object
EP0458223A3 (en) * 1990-05-23 1992-04-15 Firma Carl Zeiss Apparatus for measuring the absorption of transparent probes having an unfavourable form
US5164586A (en) * 1990-05-23 1992-11-17 Carl-Zeiss-Stiftung Arrangement for measuring the absorption of transparent specimens mounted within an integrating sphere
EP0458223A2 (en) * 1990-05-23 1991-11-27 Firma Carl Zeiss Apparatus for measuring the absorption of transparent probes having an unfavourable form
BE1006575A3 (en) * 1992-12-18 1994-10-18 Taiko Co Ltd ENLARGEMENT DEVICE FOR PRECIOUS STONES HAVING CUT FACETS THAT ARE MADE IN IT.
US5932119A (en) 1996-01-05 1999-08-03 Lazare Kaplan International, Inc. Laser marking system
US6211484B1 (en) 1996-01-05 2001-04-03 Lazare Kaplan International, Inc. Laser making system and certificate for a gemstone
US6476351B1 (en) 1996-01-05 2002-11-05 Lazare Kaplan International, Inc. Laser marking system
DE19610393A1 (en) * 1996-03-16 1997-09-18 J & M Analytische Mess & Regeltechnik Gmbh Identification and/or classification of precious stones using light spectrometer
USRE44963E1 (en) 1997-01-10 2014-06-24 Diamond Technologies, Inc. System and method for computerized evaluation of gemstones
US6473164B1 (en) 2000-02-16 2002-10-29 Gemological Institute Of America, Inc. Systems, apparatuses and methods for diamond color measurement and analysis
US7834987B2 (en) 2000-10-12 2010-11-16 Gemological Institute Of America, Inc. Systems and methods for evaluating the appearance of a gemstone
IT202100021218A1 (en) * 2021-08-05 2023-02-05 Diamsafe S R L METHOD AND DEVICE FOR UNIQUELY IDENTIFYING A FACETED GEMSTONE
WO2023012554A1 (en) * 2021-08-05 2023-02-09 Diamsafe Srl Method and device for identifying a gemstone

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)