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

Designed as two joined flowers, the petals formed of pear-shaped carved emeralds weighing a total of approximately 53.70 carats, the centers set with clusters of small round diamonds, mounted in 18 karat white gold, signed with Chinese characters for Sifen. With signed box. 

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