Ruby, Diamond, Platinum, Gold Ring, Piranesi. Photo Heritage Auctions

The ring features a cushion-shaped ruby measuring 14.05 x 9.50 x 3.87 mm and weighing 5.82 carats, enhanced by trapezoid-shaped diamonds weighing a total of 1.18 carats, set in platinum and 18k gold, marked Piranesi. A GIA Laboratory report # 5131848813, dated September 21, 2011 stating Natural Corundum, Indications of Heating (TE2) + (Case A, F2), accompanies the ruby. Gross weight 7.49 grams.Size: 6-3/4 (sizeable) Estimate: $15,000 - $20,000.

Heritage Auctions. 2013 April 29. Jewelry Signature Auction - New York - http://jewelry.ha.com