Lot 34. Platinum and 12.54 carats emerald-cut diamond ring. Estimate $180,000–220,000. Photo: Sotheby's.

Set with an emerald-cut diamond weighing 12.54 carats, size 6½. 

Accompanied by GIA report no. 5172973380 stating that the diamond is J color, VS1 clarity. 

Sotheby's. Magnificent Jewels Including the Legendary Stotesbury Emerald, New York, 25 Apr 2017, 10:00 AM