Patent EP0425426A2 successfully refreshed from Google Patents.
EP0425426A2
Expired / Lapsed
EP
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Method for identifying gemstones, particularly diamonds
Assignee: Wellborn Ltd
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Filing: 1990-10-25
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Granted: —
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Expires: 2010-10-25
Abstract
Abstract A method of identifying a gemstone, particularly a diamond by: exciting the gemstone to cause it to emit luminescence radiation according to a luminescence spectrum unique to the respective gemstone, in which the luminescence intensity uniquely varies as a function of wavelength; measuring the level of the luminescence radiation at a plurality of preselected wavelengths of its luminescence spectrum; and utilizing the levels of the luminescence radiation at the preselected wavelengths to identify the respective gemstone and to distinguish it from other gemstones.
Inventors
- 👤 Neta Uri
- 👤 Aharon Yifrach
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 07:14
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/389; G01N21/00; G01N21/84; G01N21/87; G01N21/62; G01N21/63; G01N21/64; G01N2021/6417
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A method of identifying a gemstone, particularly a diamond, comprising: exciting the gemstone to cause it to emit luminescence radiation according to a luminescence spectrum unique to the respective gemstone, in which the luminescence intensity uniquely varies as a function of wavelength; measuring the level of the luminescence radiation at preselected wavelengths of its luminescence spectrum; and utilizing the levels of the luminescence radiation at said preselected wavelengths to identify the respective gemstone and to distinguish it from other gemstones.
Claim 2
Independent Claim
80 words
A method of identifying a gemstone, particularly a diamond, comprising: exciting the gemstone to cause it to emit luminescence radiation according to a luminescence spectrum unique to the respective gemstone, in which the luminescence intensity uniquely varies as a function of wavelength; measuring the level of the luminescence radiation at preselected wavelengths of its luminescence spectrum; and utilizing the levels of the luminescence radiation at said preselected wavelengths to identify the respective gemstone and to distinguish it from other gemstones.
Claim 3
Dependent Claim
25 words
The method according to Claim 1, wherein the luminescence radiation of the gemstone is measured at least at six preselected wavelengths of its luminescence spectrum.
Claim 4
Dependent Claim
31 words
The method according to Claim 1, wherein the luminescence radiation of the gemstone is measured bY a plurality of detectors each sensitive to a different frequency band of the luminescence spectrum.
Claim 5
Independent Claim
23 words
The method according to any one of Claims 1-3, wherein said gemstone is excited by exposing it to a source of non-visible radiation.
Claim 6
Dependent Claim
25 words
The method according to Claim 4, wherein the luminescence radiation is uniformly distributed by a light-diffusing surface before it is measured at said sample points.
Claim 7
Dependent Claim
24 words
The method according to Claim 5, wherein the light radiation is measured by at least one detector via a pinhole through said light-diffusing surface.
Claim 8
Dependent Claim
27 words
The method according to Claim 6, wherein said light-diffusing surface includes a baffle shielding said pinhole and detector from direct exposure to the source of non-visible radiation.
Claim 9
Dependent Claim
49 words
The method according to Claim 6, wherein the luminescence radiation is measured by a plurality of detectors each via a pinhole through the light-diffusing surface, said light-diffusing surface including a baffle for each pinhole shielding the pinhole and its detector from direct exposure to the source of non-visible radiation.
Claim 10
Independent Claim
42 words
The method according to any one of Claims 4-8, wherein said gemstone is excited by directing said source of non-visible radiation through the table of the gemstone while the remainder of gemstone is enclosed bY an enclosure having a reflecting inner surface.
Claim 11
Dependent Claim
27 words
The method according to Claim 9, wherein said source of non-visible radiation is directed through the table of the gemstone while the gemstone is in its setting.
References Cited (Backward Citations)
No citation records indexed.
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