Pink Spinel and Diamond 'Butterfly' Brooch. Photo courtesy Tiancheng International Auctioneer Limited

Modelled as a butterfly, the thorax and head set with three variously shaped pink spinels weighing 6.80, 4.60 and 0.30 carats respectively, the wings out-lined by rose-cut and circular-cut diamonds together weighing approximately 11.90 carats. Mounted in titanium and 18 karat white gold. Estimate US$26,000 - 39,000

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/