Any corundum that is not red (ruby) is a sapphire. Sapphire has a Moh’s hardness of 9 and is the hardest mineral after diamond.

22" Sapphire & Iolite Necklace and Earrings
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Due to its color, sapphire was thought to represent a pure sky, and was thus seen to relay divine favor.

7 1/2" Sapphire & Silver Bracelet
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17" Pink Sapphire & Ruby Necklace
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Like ruby, sapphire is resistant to heat, light, and most common chemicals.