Melo-pearl and diamond ring. Photo: Sotheby's.

Set with a round melo-pearl weighing 49.57 carats, amid a conforming frame pavé-set with brilliant-cut diamonds extending to the shoulders, the diamonds together weighing approximately 1.50 carats, mounted in 18 karat pink gold. Ring size: 5½. Estimation  650,000 — 750,000 HKD 

Accompanied by GRS report numbered GRS2013-062357, dated 8 June 2013, stating that the 49.57 carat melo-pearl is natural. 

Sotheby's. Magnificent Jewels and Jadeite. Hong Kong | 07 oct. 2013 - http://www.sothebys.com