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...Rubies are one of the most popular gemstones for traditional jewelry and are very durable. The word ruby comes from ruber, Latin for red. Ruby gets its color from the element chromium. The quality of a ruby ...
... crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main component of sapphire is alumina (Al2O3). Corundum contains trace elements such as iron (F...