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Sapphires are the most valuable and rarest blue colored natural gemstones. These gemstones are highly sought after due to their royal blue color and hardness (second to diamonds), durability and luster. In the gem-industry, sapphire is used to describe the blue variety Corundum. Sapphire also refers to other gemstone varieties and colors, such as Ruby. produced in the lab is a synthetic crystal that has a Mohs Hardness rating second only behind diamonds. Th
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