Natural clam pearl, conch pearl and diamond ring. Photo: Sotheby's

Centring on a button-shaped natural clam pearl measuring approximately 16.75 - 16.80 x 12.00mm, surrounded by conch pearls measuring approximately 5.30 x 4.70 x 3.50mm to 5.10 - 5.25mm, framed by marquise-shaped and brilliant-cut diamonds together weighing approximately 4.00 carats, mounted in 18 karat white gold. Ring size: 5¾. Estimate 130,000 — 180,000 HKD

Accompanied by SSEF report numbered 68771, dated 25 June 2013, stating that the clam pearl is natural, with no indications of artificial colour modifications.

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