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ruby - wikipedia ruby from wikipedia, the free encyclopedia jump to navigation jump to search variety of corundum, mineral, gemstone this article is about the mineral or gem. for other uses, see ruby (disambiguation) . ruby natural ruby crystals from winza , tanzania general category oxide mineral variety
corundum ( aluminium oxide ). other varieties of gem-quality corundum are called sapphires . ruby is one of the traditional cardinal gems , together with amethyst , sapphire , emerald , and diamond . [ ] the word ruby comes from ruber, latin for red. the color of a ruby is due to the element chromium...
https://en.wikipedia.org/wiki/Ruby
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