Blue Nile Glossary
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  Sapphires are in the corundum family of stones, the same one as rubies. In general, if the corundum is red, it's a ruby, all other colors are sapphires with blue and pink being the most common. Sapphire is the second hardest gem after diamond. Sapphire is the birthstone for the month of September.

See also: Birthstone, Corundum, Ruby, Gemstone Education.


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