CH644452A5 - Method for determining the colour of a precious stone, in particular a diamond - Google Patents

Method for determining the colour of a precious stone, in particular a diamond Download PDF

Info

Publication number
CH644452A5
CH644452A5 CH907379A CH907379A CH644452A5 CH 644452 A5 CH644452 A5 CH 644452A5 CH 907379 A CH907379 A CH 907379A CH 907379 A CH907379 A CH 907379A CH 644452 A5 CH644452 A5 CH 644452A5
Authority
CH
Switzerland
Prior art keywords
color
light
plate
gem
stone
Prior art date
Application number
CH907379A
Other languages
German (de)
English (en)
Inventor
Geoffrey Stewart Woods
Christopher Mark Welbourn
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 CH644452A5 publication Critical patent/CH644452A5/de

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)
CH907379A 1978-10-09 1979-10-09 Method for determining the colour of a precious stone, in particular a diamond CH644452A5 (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
CH644452A5 true CH644452A5 (en) 1984-07-31

Family

ID=10500211

Family Applications (1)

Application Number Title Priority Date Filing Date
CH907379A CH644452A5 (en) 1978-10-09 1979-10-09 Method for determining the colour of a precious stone, in particular a diamond

Country Status (9)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111788474A (zh) * 2017-12-29 2020-10-16 金展科技有限公司 钻石净度测量方法和系统

Families Citing this family (5)

* 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 (ja) * 1981-06-25 1983-01-05 Shimadzu Corp ダイヤモンドカラ−測定装置
JPS5830644A (ja) * 1981-08-14 1983-02-23 Ii R C:Kk 光軸を確定する方法
JPH0711488B2 (ja) * 1992-12-18 1995-02-08 株式会社泰光 カット面が形成された宝石の拡大視装置
FR2768513B1 (fr) * 1997-09-15 1999-12-03 Jean Pierre Delgrande Procede d'analyse colorimetrique comparative et dispositif correspondant

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 (de) * 1968-03-30 1974-04-04 Eickhorst, Manfred, 2000 Hamburg Vorrichtung zur Bestimmung der photometrischen Transmission geschliffener Diamanten
BE789234A (fr) * 1971-09-29 1973-01-15 Colorant Schmuckstein G M B H Procede et dispositif pour l'enregistrement des qualites de pierres de bijouterie
AT344419B (de) * 1973-03-20 1978-07-25 Dihaco Diamanten Handels Co Vorrichtung zur feststellung der bewertungsdaten von farbedelsteinen, insbesondere brillanten
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111788474A (zh) * 2017-12-29 2020-10-16 金展科技有限公司 钻石净度测量方法和系统
CN111788474B (zh) * 2017-12-29 2024-06-04 金展科技有限公司 钻石净度测量方法和系统

Also Published As

Publication number Publication date
NL189426B (nl) 1992-11-02
AU527834B2 (en) 1983-03-24
BE879290A (fr) 1980-04-09
NL7907348A (nl) 1980-04-11
AU5150579A (en) 1980-04-17
DE2940625A1 (de) 1980-06-04
FR2438837B1 (fr) 1983-02-25
NL189426C (nl) 1993-04-01
JPS5598341A (en) 1980-07-26
FR2438837A1 (fr) 1980-05-09
IL58344A (en) 1983-09-30
ZA795228B (en) 1980-09-24

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Legal Events

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PL Patent ceased