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A ruby is a pink to red colored gemstone, a variety of the mineral corundum (aluminum oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. The ruby is considered one of the four precious stones, together with the sapphire, the emerald, and the diamond. Rubies, red gemstone, precious stones, ruby prices, bright rubies, pigeon rubies, rubies quality, cut rubies, price of rubies, ruby sale, rubies for sale
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