Synthetic Ametrine

Vladimir S. Balitsky1, Tijin Lu2, George R. Rossman3. Irina B. Makhina1, Anatolii A. Mar'in1, James E. Shigley2, Shane Elen2, Boris A. Dorogovin4

1Institute of experimental Mineralogy, Chernogolovka, Russia
2Gemological Institute of America, Carlsbad, California, USA
3Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
4Russian Reseaerch Institute for Mineral Synthesis, Alexandrov, Russia


Gem quality synthetic ametrine has been produced commercially in Russia since 1994, by hydrothermal growth from alkaline solutions. Faceted synthetic ametrin 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 twining and oclor zoning. EDXRF chemical analyses revealed higher concentrations of K, Mn, Fe, and Zn tha in natural ametine. IR spectra of the synthetic citrine portions showed more intense absorption in the 3700-2500 cm-1 range compared to natujral ametrine; the synthetic amethyst zones showed a weak diagnostic peat at 3543 cm-1.

Gems & Gemology, 35,  122-134