Sapphire and Diamond Ring. Photo courtesy Tiancheng International Auctioneer Limited

Centring on an oval-shaped modified brilliant-cut sapphire weighing 36.48 carats, within a circular-cut diamond border, flanked by two trapeze-shaped diamonds, decorated with circular-cut diamonds to the filigree basket and shank. Mounted in platinum. Ring size: 6 1/2. Estimate US$650,000 - 900,000

Accompanied by GIA report numbered 1122451983 dated 12 August 2010, stating that the 36.48 carat sapphire is natural, of Burmese (Myanmar) origin, with no indication of treatment.

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/