Natural pearl and diamond ring. Photo: Sotheby's

Centring on a natural pearl measuring approximately 13.04 x 12.82mm, surrounded by brilliant-cut diamonds, extending to the shoulders, the diamonds together weighing approximately 2.20 carats, mounted in platinum. Ring size: 6¾. Estimate 650,000 — 750,000 HKD 

Accompanied by GIA report numbered 1152243730, dated 20 February 2013, stating that the pearl is natural saltwater pearl, with no indications of treatment. 

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