Blue diffusion-treated sapphires have become a subject of considerable controversy since their introduction in significant quantities a few years ago.
Read MoreBlue diffusion-treated sapphires are becoming more prevalent than ever before.
Read MoreAn important source of gem-quality sapphire and its inclusions is found in Colombia.
Read MoreThis article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
Read MoreAn overview of the potential effects that heat treatment can have on corundum.
Read MoreA review of heat treatment methods available for use on natural or synthetic corundum.
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This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges.
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