Sapphire and diamond ring, Cartier. Photo: Sotheby's

Centring on an oval cabochon sapphire weighing 24.89 carats, surrounded by calibré-cut sapphires, to shank set with baguette and brilliant-cut diamonds together weighing approximately 1.60 carats, mounted in platinum, signed. Ring size: 5¼. Estimate 1,600,000 — 1,800,000 HKD 

Accompanied by Gübelin report numbered 12060206, dated 26  June 2012, stating that the 24.89 carat sapphire is natural, of Sri Lankan (Ceylon) origin, with no indications of heating.

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