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New data for distinguishing between hydrothermal synthetic, flux synthetic
and natural corundum
Alexei S. Bidny, Olga S. Dolgova, Ivan A. Baksheev and Irina A. Ekimenkova
Abstract: Although the synthesis of coloured corundum became widespread long ago, it may still be difficult to distinguish some natural and synthetic specimens especially if no inclusions are visible. The analysis of oxygen isotopic composition in combination with standard gemmological measurements (especially UV spectroscopy) can prove very useful in the identification of hydrothermal synthetic and flux synthetic corundums and in distinguishing them from natural stones. The indicator of flux synthesis is the presence of a 290 nm line in the photoluminescence spectrum and hydrothermal synthetic corundums contain negative δ18O values.
All the Journal articles placed online in 2010 will also be published in hard copy as a single Journal issue and sent to all paid-up Gem-A members early in 2011 as part of their 2010 subscription. Gem-A members may login to the membership area to view the full articles.