Carved emerald and diamond ring, Sifen Chang. Photo: Sotheby's.

The rectangular emerald of domed form carved in a floral motif and weighing approximately 29.75 carats, within a tiered frame of open oval links set with small round diamonds weighing approximately 1.95 carats, mounted in 18 karat white gold, size 6, signed with Chinese characters for Sifen. With signed box. Lot Sold: 11,250 USD

Sotheby's. Magnificent Jewels. New York | 04 Dec 2007. http://www.sothebys.com