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Ruby
Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire.
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Research
Spring 1991 G&G Lab Notes
This section, from the Spring 1991 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
Gemstone Durability: Design to Display
A treatise on the design, display, care and repair of fine gemstones.
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.
A Survey of the Gemstone Resources of China
China has identified many deposits with significant potential to produce gemstones; various species are discussed.
Natural Rubies with Glass-Filled Cavities
An examination and analysis of 15 natural rubies with glass-filled cavities.
The Rubies of Burma: A Review of the Mogok Stone Tract
A review of the history of this area, its geology, and the mining methods that have predominated.
The Chanthaburi-Trat Gem Field, Thailand
Thailand has become the world's major source of gem ruby.
Heat Treating Corundum: The Bangkok Operation
An overview of the potential effects that heat treatment can have on corundum.
Sri Lanka: The Gem Island
An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.
Ruby in Diamond
The first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.
