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Tairus, in Novosibirsk, has produced yet another new type ofRussian hydrothermal synthetic emerald, now being marketed in Bangkok. Examination of eight fac eted samples revealed that, with the exception of certain characteristic inclusions, the basic gemological properties shown by this new synthetic are essentially the same as those encountered in other hydrothermally grown synthetic emeralds and some natural emeralds. If the characteristic inclusions are not present, distinctive spectral characteristics in both the midand near-infrared regions ofthe spectrum will serve to separate these synthetic emeralds from their natural counterparts.

Gemological Investigation of a New Type of Russian Hydrothermal Synthetic Emerald