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Blue Sapphires have the highest value and are rarest of all blue colored gemstones. Their beautiful royal color, hardness and durability are all reasons why they're so sought-after. In the gem trade, sapphire refers only to the blue variety (such as the mineral Corundum) without any prefix. Sapphire includes all colors and varieties of Corundum, with the exception of Ruby, the red variety. Sapphire corundum produced in the lab is a synthetic crystal that has a Mohs Hardness rating second only behind diamonds. This makes it extremely durable. Durabil
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