Beryllium Diffusion of Ruby and Sapphire
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.
Abstracts; Summer 2009
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.
Heat Treating the Sapphires of Rock Creek, Montana
Renewed interest in large-scale commercial mining of Montana sapphires motivated a detailed study of the heat treatment of sapphire from the Rock Creek deposit.
Sapphires from Australia
An overview of Australia's recent significance in the production of blue sapphire.
Heat Treating Corundum: The Bangkok Operation
An overview of the potential effects that heat treatment can have on corundum.
Heat Treating Ruby and Sapphire: Technical Aspects
A review of heat treatment methods available for use on natural or synthetic corundum.
Diagnostic Features and Heat Treatment of Kashmir Sapphires
Today, only by combining different gemmological tests with years of practical experience, can a conclusive determination of the origin of a sapphire be made.
The Identification of Blue Diffusion-Treated Sapphires
Blue diffusion-treated sapphires are becoming more prevalent than ever before.
The Chanthaburi-Trat Gem Field, Thailand
Thailand has become the world's major source of gem ruby.
Update on Diffusion-Treated Corundum: Red and Other Colours
Blue diffusion-treated sapphires have become a subject of considerable controversy since their introduction in significant quantities a few years ago.