heated sapphire
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FTIR in Gem Testing | A Pink Sapphire Lesson
A discussion of DRIFTS vs the Beam Condenser FTIR attachment in the testing of pink sapphire. The DRIFTS accessory is generally much better at unmasking heat treatment in ruby and sapphire.
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FTIR in Gem Testing | FTIR Intrigue
The use of Fourier-Transform Infrared Spectroscopy (FTIR) in gem identification, with examples of sapphire & jadeite.
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Testing Yellow Sapphire | Passport to Obscurity
The examination of a yellow sapphire provides a lesson in the power of gemological microscopy.