Pink tourmaline and diamond ring. Photo courtesy Tiancheng International Auctioneer Limited

Centring on a cabochon pink tourmaline weighing 11.26 carats, framed by circular-cut diamonds, to the diamond-set filigree basket and shank. Mounted in 18 karat yellow gold, with Russian assay mark. Signed Tenzo. Ring size: 6 1/2. Estimate US$5,200 - 7,700

Accompanied by Tokyo Gem Laboratory report numbered 22070228 dated 05 July 2012, stating that the 11.26 carat pink tourmaline is natural, of Purplish Pink colour. 

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/