18 karat white gold, tanzanite and diamond ring, Sifen Chang. Photo Sotheby's

Designed as a cluster of seven tumbled tanzanite beads weighing 80.50 carats, accented by vines set with round diamonds weighing .68 carat, size 6¼, with Chinese characters for Sifen Chang. With signed box. Estimation 20,000 — 30,000 USD

Tanzanite, the beautiful and rare blue-violet variety of the mineral zoisite, was discovered in the foothills of Mount Kiliminjaro in 1967 and named in tribute of its host country, Tanzania.

Sotheby's. Important Jewels. New York | 06 Feb 2014 - www.sothebys.com