Sapphire

Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide (α-Al2O3) with trace amounts of elements such as iron, titanium, cobalt, lead, chromium, vanadium, magnesium, boron, and silicon. The name sapphire is derived from the Latin word sapphirus, itself from the Greek word sappheiros (σάπφειρος, itself from a Semitic origin), which referred to lapis lazuli. Sapphire with colors other than its typical blue is referred to as "fancy sapphire", and can be in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors.

Red corundum stones also occur, but are called rubies rather than sapphires.
Pink-colored corundum may be classified either as ruby or sapphire depending on the locale.
Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain