Sapphire and diamond ring - Sotheby's.  

Set to the centre with an oval mixed-cut sapphire within an elliptical frame decorated with brilliant-cut diamonds, size L, French assay and maker's marks, two small diamonds deficient. Estimate: 15,000 - 20,000 GBP

Sotheby's. Jewels. London | 11 Apr 2013 www.sothebys.com