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Sapphire
The name “sapphire” can also apply to any corundum that’s not ruby red, another corundum variety.
See Gem As
Tools
Research
Status of Ruby and Sapphire Mining in the Mogok Stone Tract
Burma, now named Myanmar, has for centuries been considered the world's preeminent source of fine rubies.
The Identification of Blue Diffusion-Treated Sapphires
Blue diffusion-treated sapphires are becoming more prevalent than ever before.
Carbon Dioxide Fluid Inclusions as Proof of Natural-Colored Corundum
An important clue in identifying natural-colored corundum is the presence of carbon dioxide fluid inclusions.
The Chanthaburi-Trat Gem Field, Thailand
Thailand has become the world's major source of gem ruby.
Sri Lanka: The Gem Island
An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.
Heat Treating Ruby and Sapphire: Technical Aspects
A review of heat treatment methods available for use on natural or synthetic corundum.
