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Sapphire is a type of corundum. It occurs in every color except red, because red corundum is ruby. It is actually more durable than diamond, even though diamond can't be scratched. Durability in this case refers to corundum's ability to withstand wear and tear. Some sapphires grow in the earth in such a way that when they are cut cabochon style (which is basically a smooth, domed shape), they display a six-rayed star that moves around as the stone is moved around a fixed light source. This is refered to as "asterism".
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