Sapphire is a gem quality variety of the mineral corundum. It is the second hardest substance on earth after diamond, rating 9 on the Mohs scale of mineral hardness. Corundum itself is not a very rare mineral, but gem quality corundum is extremely rare.
Amazing earrings and great quality. 5/5
Lovely earrings, I've not worn a pair like these in a very long time. Extremely comfy and look classy.
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