Beautiful natural tanzanite ring made of sterling silver with platinum overlay. There are over 3 carats of genuine tanzanites in this setting. Size 7. If you're looking for something to make a statement, then this is the ring for you! Stamped STS 925 * Since its discovery in 1967, the violet blue gemstone was prized for its color and rarity. And with deposits expected to run out in the next twenty years, this already precious stone is expected to become more valuable in the coming years. *Jewelry made by STS Jewels Inc. It is sold on QVC, HSN, JTV, Shop LC, and Shop HQ.