Sapphire and diamond ring, Cusi - photo Sotheby's

Of crossover design, set with a pear-shaped sapphire and a pear-shaped diamond weighing 8.53 carats, the mount highlighted with baguette diamonds, size 48, signed Cusi, French assay and maker's marks. Estimate: 150,000 - 250,000 CHF - Lot sold. 752,500 CHF

Accompanied by GIA report no. 2145866795, stating that the diamond is D Colour, VS1 Clarity 

Sotheby's. Magnificent Jewels. Geneva | 14 Nov 2012 www.sothebys.com