Before It Was Tanzanite

It's one thing to talk about heated tanzanite and another to actually see the transformation of green/brown zoisite into its purple-blue variety. L. Allen Brown of All That Glitters, Methuen, Mass., is a veteran at heat treatment of tanzanite. He hoped to get a spectacular blue from the very slightly olive-green natural-color zoisite pictured here. Brown says his starting material had a relatively nice green and could have been sold as a collector's stone. The chance of getting a more salable and valuable blue tanzanite resulted in moderate heat treatment for a period of just hours, and the green zoisite was transformed into the beautiful tanzanite seen here. It was not a complete success. "I think the green would have been better left unheated," says Brown. Still, he now has a strongly saturated salable blue tanzanite. For more information on All That Glitters visit www.atggems.ho

This content is exclusive to JCK Pro subscribers. Subscribe now to access this and much more with discount code GOPRO21 for $199 for an entire year of access (reg. $249).


Already a JCK Pro? Log in

A JCK Pro subscription is your all-access pass to people and resources on the
cutting edge of the retail jewelry industry, from the industry authority you
know and trust

Learn about the Perks of JCK Pro

Log Out

Are you sure you want to log out?

CancelLog out