Ruby and diamond ring. Photo courtesy Tiancheng International Auctioneer Limited

Centring on a cushion-shaped ruby weighing 9.78 carats, decorated with a circular-cut diamond border, flanked by two half-moon shaped diamonds lined with circular-cut diamonds extending to the shank. Mounted in platinum. Signed Gad & Co. Ring size: 6 3/4. Estimate US$260,000 - 390,000

Accompanied by Gübelin report numbered 0509544 dated 28 September 2005, stating that the 9.78 carat ruby is natural, of purple red colour, with no indication of heating.

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/