NL189426C - METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE. - Google Patents

METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE.

Info

Publication number
NL189426C
NL189426C NLAANVRAGE7907348,A NL7907348A NL189426C NL 189426 C NL189426 C NL 189426C NL 7907348 A NL7907348 A NL 7907348A NL 189426 C NL189426 C NL 189426C
Authority
NL
Netherlands
Prior art keywords
color
determining
cut gemstone
table cut
gemstone
Prior art date
Application number
NLAANVRAGE7907348,A
Other languages
Dutch (nl)
Other versions
NL189426B (en
NL7907348A (en
Original Assignee
De Beers Cons Mines Ltd
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 De Beers Cons Mines Ltd filed Critical De Beers Cons Mines Ltd
Publication of NL7907348A publication Critical patent/NL7907348A/en
Publication of NL189426B publication Critical patent/NL189426B/en
Application granted granted Critical
Publication of NL189426C publication Critical patent/NL189426C/en

Links

Classifications

    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Spectrometry And Color Measurement (AREA)
NLAANVRAGE7907348,A 1978-10-09 1979-10-03 METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE. NL189426C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7839847 1978-10-09
GB7839847 1978-10-09

Publications (3)

Publication Number Publication Date
NL7907348A NL7907348A (en) 1980-04-11
NL189426B NL189426B (en) 1992-11-02
NL189426C true NL189426C (en) 1993-04-01

Family

ID=10500211

Family Applications (1)

Application Number Title Priority Date Filing Date
NLAANVRAGE7907348,A NL189426C (en) 1978-10-09 1979-10-03 METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE.

Country Status (9)

Country Link
JP (1) JPS5598341A (en)
AU (1) AU527834B2 (en)
BE (1) BE879290A (en)
CH (1) CH644452A5 (en)
DE (1) DE2940625A1 (en)
FR (1) FR2438837A1 (en)
IL (1) IL58344A (en)
NL (1) NL189426C (en)
ZA (1) ZA795228B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA813263B (en) * 1980-06-04 1982-06-30 De Beers Cons Mines Ltd The assessment of colour in diamonds and other gems
JPS58728A (en) * 1981-06-25 1983-01-05 Shimadzu Corp Diamond color measuring device
JPS5830644A (en) * 1981-08-14 1983-02-23 Ii R C:Kk Method for deciding optical axis
JPH0711488B2 (en) * 1992-12-18 1995-02-08 株式会社泰光 A jewel magnifying device with a cut surface
FR2768513B1 (en) * 1997-09-15 1999-12-03 Jean Pierre Delgrande COMPARATIVE COLORIMETRIC ANALYSIS METHOD AND CORRESPONDING DEVICE
WO2019129238A1 (en) * 2017-12-29 2019-07-04 Goldway Technology Limited Diamond clarity measurement process and system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2992588A (en) * 1958-02-03 1961-07-18 Beckman Instruments Inc Photometer reflectance unit
DE1772105C2 (en) * 1968-03-30 1974-04-04 Eickhorst, Manfred, 2000 Hamburg Device for determining the photometric transmission of cut diamonds
BE789234A (en) * 1971-09-29 1973-01-15 Colorant Schmuckstein G M B H METHOD AND DEVICE FOR REGISTRATION OF THE QUALITIES OF JEWELERY STONES
AT344419B (en) * 1973-03-20 1978-07-25 Dihaco Diamanten Handels Co DEVICE FOR DETERMINING THE EVALUATION DATA OF COLORED GEMS, IN PARTICULAR DIAMONDS
ZA765149B (en) * 1976-08-27 1978-04-26 De Beers Ind Diamond Measurement of optical properties
JPS5378855A (en) * 1976-12-21 1978-07-12 Nec Corp Polygonal jewery identifying device

Also Published As

Publication number Publication date
FR2438837B1 (en) 1983-02-25
NL189426B (en) 1992-11-02
ZA795228B (en) 1980-09-24
CH644452A5 (en) 1984-07-31
JPS5598341A (en) 1980-07-26
NL7907348A (en) 1980-04-11
FR2438837A1 (en) 1980-05-09
AU527834B2 (en) 1983-03-24
IL58344A (en) 1983-09-30
AU5150579A (en) 1980-04-17
BE879290A (en) 1980-04-09
DE2940625A1 (en) 1980-06-04

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Legal Events

Date Code Title Description
A85 Still pending on 85-01-01
BA A request for search or an international-type search has been filed
BB A search report has been drawn up
BC A request for examination has been filed
V1 Lapsed because of non-payment of the annual fee

Effective date: 19980501