Very attractuve fancy deep blue diamond and diamond ring, Graff. Photo Sotheby's

Set at the centre with a fancy deep blue marquise-shaped diamond weighing 2.07 carats, between heart-shaped diamond shoulders, size 47, signed Graff, case. Lot 722. Estimation 780,000-1,100,000 CHF

Accompanied by GIA report no. 11332187, stating that the diamond is Fancy Deep Blue, Natural Colour, VS2 Clarity.

Sotheby's. Magnificent Jewels and Noble Jewels. Genève | 14 mai 2012, 11:00 AM www.sothebys.com