What birthstone is sapphire?
September's Birthstone is Sapphire.
The sapphire, birthstone for September, is a relative of July's birthstone, the ruby. Like ruby, it is a form of the mineral corundum, a normally drab gray mineral. Red corundum is called ruby, while all other gem quality forms of corundum are called sapphires.
The sapphire is the birthstone for September.
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