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Smithsonian National Museum of Natural History

Corundum (var. ruby)

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                                          asset is available
Photo by Ken Larsen. Click to zoom.
SpecimenCatalog NumberLocalityWeight
Corundum (var. ruby)NMNH G8481-00Thailand3.89 ct
Corundum (var. ruby)NMNH G8479-00Thailand5.65 ct
Corundum (var. ruby)NMNH G9215-00Thailand3.32 ct

Gift of Mr. and Mrs. Edward J. Slattery in 1980.

Ruby is the red variety of the mineral corundum and one of the most popular and valuable gemstones. A major source of rubies in the 1970s and 80s was Thailand, near the Cambodian border. The stones are typically brownish-red to purplish-red, almost garnet-like in color. They are darker than those from Burma and are commonly heat-treated to produce a purer red color. This 3.89-carat cushion cut ruby, set in an 18k white gold ring, is from Thailand. It is accented with four emerald cut and eight round brilliant cut diamonds.



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