English

The counterfeiting of gems, etc.

"Brief discussions of manufacture of synthetic gemstones and counterfeits, and how they may be detected, ie, for spinels, emeralds, diamonds, turquoise, opals, pearl. This appears to be the only substantial paper that Tully wrote. It is very scarce."-​-​Gemology by J. Sinkankas, entry no. 6728. Partial contents: Synthetic rubies and sapphires -- Synthetic spinels -- Synthetic alexandrite -- The Soudé emerald -- Scientific (synthetic) aquamarine -- Synthetic (so-called) diamond -- Chinese turquoise -- False lapis lazuli -- Opal doublets -- Strass or pastes -- Pearls.

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