|Hillman Hall of Minerals and Gems
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Ruby is the red gem variety of the mineral corundum. It is second in hardness only to diamond and so rare that top-quality gemstones are worth more than white diamonds of similar size. The best rubies come from Myanmar (Burma), Sri Lanka (Ceylon), and Thailand. Ruby has also been produced from the southeastern United States and from Montana, though only rarely and usually of inferior size or quality.
Corundum variety Ruby