Tanzanite

Named by Tiffany's for the gem's origin, tanzanite is new to many jewelry buyers. Seldom does a beautiful and popular gemstone enter the world market. But in 1967 miners in northern Tanzania, Africa, discovered a deep periwinkle-blue zoisite, which was practically an instant success. This gem is strongly trichroic. As you view the jewel from different angles, the facets dance with electric hues from purple to blue, careful cutting avoids the third grayish tone.

Most heat treatments intensify hues and/or clarify internal inclusions. Even though it is possible to find examples of natural-colored tanzanite, the vast majority on the market is a result of heating the greenish-brown zoisite. The treatment is permanent, leaving no visible indication that the material has been heated.

Tanzanite needs extra attention. Two characteristics affect its care. First, because it is softer than quartz, the usual precautions apply. Protect tanzanite rings from being scratched by other gems, metal, and stones. Facet edges easily abrade. Second, tanzanite has internal cleavage planes that can part if struck. It is also somewhat brittle like emeralds. Although perfect for pins, earrings, and pendants, tanzanite set in rings is vulnerable, so be gentle. Wash your tanzanite only in warm soapy water and do not use mechanical cleaners or chemicals. Dry with a soft cloth. ( Thank you to Fred Ward's Gem Care. )

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