Conch pearl and diamond ring. Photo courtesy Tiancheng International Auctioneer Limited

Centring on a conch pearl measuring approximately 19.00 x 12.70 x 11.55mm, accented by brilliant-cut diamonds to the shank. Mounted in 18 karat yellow gold. Ring size: 6 1/2. Estimate: US$30,000 - 39,000

Accompanied by a SSEF report numbered 65193 dated 02 October 2012, stating that the baroque drop-shaped conch pearl is natural, undrilled, pink to white with a fine flame structure, with no indication of artificial colour modification.

Tiancheng International Auctioneer Limited. SPRING AUCTION 2013 JEWELLERY AND JADEITE. 15 Jun · 3 pm. Hong Kong Headquarters 30/F Bank of China Tower 1 Garden Road, Central Hong Kong http://www.tianchengauction.com/