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In gemmology, an asterism is an optical phenomenon displayed by some rubies, sapphires, and other gems of an enhanced reflective area in the shape of a "star" on the surface of a cabochon cut from the stone. Star sapphires and rubies get their asterism from the titanium dioxide impurities (rutile) present in them.
Additional recommended knowledge
A distinction can be made between two types of asterism:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Asterism_(gemmology)". A list of authors is available in Wikipedia.|