Raw RUBY StonesWhat is Ruby? Ruby is a precious red gemstone and one of the most valuable stones in the world. It is the red variety of the mineral corundum, and its color comes mainly from traces of chromium. Basic facts: Chemical composition: Aluminum oxide (AlO) Color: Deep red to pinkish red Hardness: 9 on the Mohs scale (very durable, second only to diamond) Famous sources: Myanmar, Sri Lanka, Thailand, Madagascar, and Mozambique Rubies have been prized for
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