- Ruby is a light pink to blood red gemstone, a variety of the mineral corundum. The common red color is caused mainly by the element chromium. Other varieties of gem-quality corundum are called sapphires. It is considered one of the four precious stones, together with the sapphire, the emerald and the diamond. Prices of rubies are primarily determined by color (the brightest and best "red" called Pigeon Blood Red, command a huge premium over other rubies of similar quality). Ruby is the birthstone associated with July.
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Ruby Jewelry 
