The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.
Read MoreRenewed interest in large-scale commercial mining of Montana sapphires motivated a detailed study of the heat treatment of sapphire from the Rock Creek deposit.
Read MoreBlue diffusion-treated sapphires have become a subject of considerable controversy since their introduction in significant quantities a few years ago.
Read MoreToday, only by combining different gemmological tests with years of practical experience, can a conclusive determination of the origin of a sapphire be made.
Read MoreBlue diffusion-treated sapphires are becoming more prevalent than ever before.
Read MoreAn overview of Australia's recent significance in the production of blue sapphire.
Read MoreThailand has become the world's major source of gem ruby.
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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