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.
Dainty, beautiful earrings. Excellent after service. Delighted with them
Excellent. So pleased to find this style as they are difficult to come by.
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