Coloured Diamond, Diamond and Stone Butterfly Brooch. Photo courtesy Tiancheng International Auctioneer Limited

The brooch modelled as a butterfly, the thorax set with a collet-set oval-shaped yellow diamond and pavé-set black diamonds, the wings set with faceted diamond plaques, further outlined by 18 karat gold wing vines within pavé-set brown diamonds and yellow diamonds, the head and antennae accented by rose-cut diamonds. Mounted in 18 karat yellow and blackened gold. Estimate US$9,700 - 13,000

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/