The ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium 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 corun...
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April 12nd 2012 ·
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Some descriptions above may come from the Wikipedia article Ruby, licensed under CC-BY-SA full list of contributors here.