Physical Properties of Sapphire Sapphire is one of the most famous and costly precious gemstones in the word, and regarded as the birthstone of September. It is a type of corundum, the same as ruby (rubies are merely red corundums), and although associated with the color blue, may also be found in a multitude of colors such as colorless, black, grey, yellow, green, purple, orange, pink, and even changeable colors. The sapphires that are not colored blue are often called “fancy” or “parti” sapphires. Color change sapphires are those with certain inclusions in them such as chromium that absorb different
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