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.
The Identification of Blue Diffusion-Treated Sapphires
Blue diffusion-treated sapphires are becoming more prevalent than ever before.
Sapphire from the Mercaderes-Río Mayo Area, Cauca, Colombia
An important source of gem-quality sapphire and its inclusions is found in Colombia.
This article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
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.
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.
Ruby and Sapphire Production and Distribution: A Quarter Century of Change
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.