Optical testing system for distinguishing a silicon carbide gemstone from a diamond
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United States of America Patent
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Nov 10, 1998
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N/A
app pub date -
Feb 10, 1997
filing date -
Feb 12, 1996
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Abstract
Diamond gemstones and gemstones formed of crystals of silicon carbide are distinguished from each other by introducing a band of ultraviolet light into a target gemstone and measuring the transmissivity of that band of light by the gemstone. A diamond will transmit light within a certain band of the ultraviolet spectrum, while a silicon carbide gemstone will block light within this band. Several instruments for carrying out this procedure are described, including an instrument that utilizes a fiberoptic strand to convey ultraviolet light that has passed through the gemstone to a solid state photodetector.
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