Optics: measuring and testing – Crystal or gem examination
Patent
1997-02-03
1998-11-10
Rosenberger, Richard A.
Optics: measuring and testing
Crystal or gem examination
G01N 2131, G01N 2187, G01N 2165, B07C 5342
Patent
active
058352007
ABSTRACT:
In order to examine a gemstone, the stone is irradiated and observed though a filter (5) at a first wavelength which is characteristic of a first class of gemstones. The filter can be rocked from a setting normal to the optical axis to transmit radiation of at least one reference wavelength. The intensities of radiation transmitted at first and reference wavelengths are observed and compared, to classify the gemstone as belonging to the first class or not. In order to detect whether the gemstone is a diamond or diamond simulant, the first wavelength comprises raman emission characteristic of diamond. In order to detect whether the gemstone is definitely natural or not definitely natural, the gemstone is classified as definitely natural if there is a maximum of absorption of radiation at 415.5 nm.
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Smith Martin Phillip
Smith Robin Wynclyffe
Welbourn Christopher Mark
Gersan Establishment
Rosenberger Richard A.
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