Attractive ruby and  diamond ring. Photo: Sotheby's.

Set at the centre with a step-cut ruby weighing 12.02 carats, between triangular diamonds, size 53, sizing band. Estimation 460,000-730,000 CHF. Lot 668 vendu: 938,500 CHF

Accompanied by Gübelin report no.11040057, stating that the ruby is of Burmese origin, with no indications of heating. Further accompanied by SSEF report no.59517, stating that the ruby is of Burmese origin, with indications of heating.

Sotheby's. A Superb Private Collection of Gems and Jewels. Genève | 15 mai 2012 www.sothebys.com