Rare sapphire and diamond ring. Photo: Sotheby's

Centring on a cushion-shaped sapphire weighing 12.52 carats, flanked on each side by a half-moon diamond together weighing approximately 1.30 carats, mounted in platinum. Ring size: 6. Estimate 7,200,000 — 8,500,000 HKD 

Accompanied by Gübelin and AGL reports numbered 1007271 and CS 41974 respectively, dated 3 August and 9 April 2010, stating that the 12.52 carat sapphire is natural, of Kashmir origin, with no indications of heating. 

Sotheby's. Magnificent Jewels and Jadeite. Hong Kong | 07 Oct 2013- http://www.sothebys.com