Reference

Stone Sense: Tourmaline -- the extended version

Tourmaline is a gemstone of many colors. In this extended version of the Stone Sense column from Art Jewelry magazine's January 2010 issue, learn even more about common species of tourmaline, bicolor and parti-color stones, treated stones, traditional terms used to describe tourmaline, and more.
by Richard M. Shull, G.G.
Published: November 20, 2009
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