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Published June 1999 | metadata_only
Journal Article

Russian Synthetic Ametrine


Gem-quality synthetic ametrine has been produced commercially in Russia since 1994, by hydrothermal growth from alkaline solutions. Faceted synthetic ametrine has many similarities to its natural counterpart from Bolivia. For the most part, however, the synthetic ametrine obtained for this study could be identified by a combination of characteristics, including growth features such as twinning and color zoning. EDXRF chemical analyses revealed higher concentrations of K, Mn, Fe, and Zn than in natural ametrine. IR spectra of the synthetic citrine portions showed more intense absorption in the 3700-2500 cm^(-1) range compared to natural ametrine; the synthetic amethyst zones showed a weak diagnostic peak at 3543 cm^(-1).

Additional Information

© 1999 Gemological Institute of America. The authors thank Dr. llene Reinitz, John Koivula, Shane McClure, and Dr. Mary Johnson of the GIA Gem Trade Laboratory for their useful comments on the manuscript, and Julia Goreva of Caltech for her assistance with the translation of technical articles from Russian to English. Funding for research at Caltech was provided by the White Rose Foundation. Funding for research in Russia was provided by the Russian Basic Research Foundation (grant# 97-05-64805).

Additional details

August 22, 2023
August 22, 2023