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Ruby

Ruby is a deeply red, adamantine precious gem of the mineral corundum, which also includes sapphire. It is extremely rare, with the highest quality specimens more elusive than diamonds; the most important sources are in Bangkok, Myanmar, and Madagascar. Ruby is made of aluminum oxide (Al2O3), but owes its color to chromium impurities.

Chemical Formula

Al2O3:Cr

BirthStone Month

July

Gemstone Mineral

Corundum

Hardness

9.00

Specific Gravity

3.960 - 4.050

Double Refraction

1.757

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