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Are Rubies Sapphires?

Date August 19, 2016
Are Rubies Sapphires?

Rubies are red and sapphires are… not red (and most often blue). Though rubies and sapphires are both the mineral corundum, since we identify gems by both mineral and color variation, rubies are not sapphires, and vice versa. So which is which? Rubies are red corundum while sapphires encompass all other gem color variations of the mineral (which happens to be second only to diamonds in hardness).