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What is Gemstone Luminescence?

Gemstone luminescence is a glow that occurs when certain stones are subjected to energy such as UV light. This effect can help gemologists identify gems.

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Andalusite Value, Price, and Jewelry Information

Everything you ever wanted to know about andalusite. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.

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What is Gemstone Pleochroism?

Some gems show pleochroism, two or three different colors depending on the viewing angle. Learn why this occurs and how it helps gemologists identify gems.