A ruby is a corundum, which is a crystalline form of an oxide of aluminum. It is infused with a small amount of chromium, which gives ruby its red color. A ruby is a beautiful red stone and is usually expensive.

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A ruby is a corundum, which is a crystalline form of an oxide of aluminum. It is infused with a small amount of chromium, which gives ruby its red color. A ruby is a beautiful red stone and is usually expensive.