GB2307040A - Distinguishing natural from synthetic diamond - Google Patents

Distinguishing natural from synthetic diamond

Info

Publication number
GB2307040A
GB2307040A GB9704258A GB9704258A GB2307040A GB 2307040 A GB2307040 A GB 2307040A GB 9704258 A GB9704258 A GB 9704258A GB 9704258 A GB9704258 A GB 9704258A GB 2307040 A GB2307040 A GB 2307040A
Authority
GB
United Kingdom
Prior art keywords
diamond
phosphorescence
natural
irradiation
synthetic diamond
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.)
Granted
Application number
GB9704258A
Other versions
GB9704258D0 (en
GB2307040B (en
Inventor
Paul Martyn Spear
Christopher Mark Welbourn
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.)
Gersan Ets
Original Assignee
Gersan Ets
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
Priority claimed from GB9417665A external-priority patent/GB9417665D0/en
Application filed by Gersan Ets filed Critical Gersan Ets
Priority to GB9704258A priority Critical patent/GB2307040B/en
Publication of GB9704258D0 publication Critical patent/GB9704258D0/en
Publication of GB2307040A publication Critical patent/GB2307040A/en
Application granted granted Critical
Publication of GB2307040B publication Critical patent/GB2307040B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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)
  • Spectrometry And Color Measurement (AREA)

Abstract

In order to provide a simple, safe and compact apparatus for distinguishing natural colourless or near-colourless diamond from synthetic diamond, an apparatus has a chamber (2) in which a flash lamp (4) irradiates a stationary diamond (7) with irradiation which has a substantial component of ultraviolet light below 250 nm or 225 nm. The intensity of phosphorescence emitted by the diamond (7) after irradiation by the lamp (4) is measured by a photomultiplier tube (9), which gives a signal to a microprocessor. There is a visual display (13) of the elapsed time for the phosphorescence intensity to decrease to a threshold value. The diamond (7) is classified as probably natural if it has no phosphorescence, or a short phosphorescence time.
GB9704258A 1994-09-02 1995-08-18 Distinguishing natural from synthetic diamond Expired - Fee Related GB2307040B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9704258A GB2307040B (en) 1994-09-02 1995-08-18 Distinguishing natural from synthetic diamond

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9417665A GB9417665D0 (en) 1994-09-02 1994-09-02 Distinguishing natural from synthetic diamond
GB9704258A GB2307040B (en) 1994-09-02 1995-08-18 Distinguishing natural from synthetic diamond
PCT/GB1995/001968 WO1996007894A1 (en) 1994-09-02 1995-08-18 Distinguishing natural from synthetic diamond

Publications (3)

Publication Number Publication Date
GB9704258D0 GB9704258D0 (en) 1997-04-16
GB2307040A true GB2307040A (en) 1997-05-14
GB2307040B GB2307040B (en) 1998-05-27

Family

ID=26305549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9704258A Expired - Fee Related GB2307040B (en) 1994-09-02 1995-08-18 Distinguishing natural from synthetic diamond

Country Status (1)

Country Link
GB (1) GB2307040B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2336901A (en) * 1998-04-30 1999-11-03 Gersan Ets Examining diamonds
GB2551133A (en) * 2016-06-06 2017-12-13 De Beers Uk Ltd Gemstone viewer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034066A (en) * 1973-11-02 1977-07-05 General Electric Company Method and high pressure reaction vessel for quality control of diamond growth on diamond seed
EP0071462A1 (en) * 1981-07-27 1983-02-09 Lce, Ltd. Method and apparatus for analyzing gems
EP0425426A2 (en) * 1989-10-27 1991-05-02 Wellborn Ltd. Method for identifying gemstones, particularly diamonds
WO1991016617A1 (en) * 1990-04-24 1991-10-31 Gersan Establishment Method and apparatus for examining an object
GB2267147A (en) * 1992-05-19 1993-11-24 Gersan Ets Classifying objects, E.G. Diamonds, by radiation transmission
GB2275788A (en) * 1993-03-05 1994-09-07 Gersan Ets Distinguishing natural from synthetic diamond

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034066A (en) * 1973-11-02 1977-07-05 General Electric Company Method and high pressure reaction vessel for quality control of diamond growth on diamond seed
EP0071462A1 (en) * 1981-07-27 1983-02-09 Lce, Ltd. Method and apparatus for analyzing gems
EP0425426A2 (en) * 1989-10-27 1991-05-02 Wellborn Ltd. Method for identifying gemstones, particularly diamonds
WO1991016617A1 (en) * 1990-04-24 1991-10-31 Gersan Establishment Method and apparatus for examining an object
GB2267147A (en) * 1992-05-19 1993-11-24 Gersan Ets Classifying objects, E.G. Diamonds, by radiation transmission
GB2275788A (en) * 1993-03-05 1994-09-07 Gersan Ets Distinguishing natural from synthetic diamond

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2336901A (en) * 1998-04-30 1999-11-03 Gersan Ets Examining diamonds
GB2551133A (en) * 2016-06-06 2017-12-13 De Beers Uk Ltd Gemstone viewer

Also Published As

Publication number Publication date
GB9704258D0 (en) 1997-04-16
GB2307040B (en) 1998-05-27

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Legal Events

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

Effective date: 20030818