They also may be created synthetically in laboratories for industrial or decorative purposes in large crystal boules. Pink colored corundum may be either classified as ruby or sapphire depending on locale.Ĭommonly, natural sapphires are cut and polished into gemstones and worn in jewelry. The only color corundum stone that the term sapphire is not used for is red, which is called a ruby. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors "parti sapphires" show two or more colors. Sapphires are a precious gemstone, a variety of the mineral corundum, consisting of aluminum oxide ( α- Al 2 O 3) with trace amounts of elements such as iron, titanium, chromium, copper, or magnesium.
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