ZA795228B - The assessment of colour in diamonds and other gems - Google Patents

The assessment of colour in diamonds and other gems

Info

Publication number
ZA795228B
ZA795228B ZA00795228A ZA795228A ZA795228B ZA 795228 B ZA795228 B ZA 795228B ZA 00795228 A ZA00795228 A ZA 00795228A ZA 795228 A ZA795228 A ZA 795228A ZA 795228 B ZA795228 B ZA 795228B
Authority
ZA
South Africa
Prior art keywords
gems
diamonds
colour
assessment
Prior art date
Application number
ZA00795228A
Other languages
English (en)
Inventor
C Welbourn
G Woods
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 ZA795228B publication Critical patent/ZA795228B/xx

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)
ZA00795228A 1978-10-09 1979-10-02 The assessment of colour in diamonds and other gems ZA795228B (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
ZA795228B true ZA795228B (en) 1980-09-24

Family

ID=10500211

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00795228A ZA795228B (en) 1978-10-09 1979-10-02 The assessment of colour in diamonds and other gems

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)

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 (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
WO2019129238A1 (fr) * 2017-12-29 2019-07-04 Goldway Technology Limited Procédé et système de mesure de clarté de diamant

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

Also Published As

Publication number Publication date
JPS5598341A (en) 1980-07-26
FR2438837B1 (fr) 1983-02-25
AU527834B2 (en) 1983-03-24
NL189426C (nl) 1993-04-01
NL7907348A (nl) 1980-04-11
DE2940625A1 (de) 1980-06-04
BE879290A (fr) 1980-04-09
IL58344A (en) 1983-09-30
CH644452A5 (en) 1984-07-31
FR2438837A1 (fr) 1980-05-09
NL189426B (nl) 1992-11-02
AU5150579A (en) 1980-04-17

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