Lot 626. Fine 25.00 carats Colombian emerald and diamond ring. Estimate:  940,000 – 1,400,000 CHF. Lot sold 1,025,000 CHF. Courtesy Sotheby's

Claw-set with a cushion-shaped emerald weighing 25.00 carats between trapeze-shaped diamond shoulders, size 50^1/2. 

Accompanied by GIA report no. 2125061550 and AGL report no. CS41959, each stating that the emerald is of Colombian origin, with no indications of clarity enhancement.

Sotheby's. Magnificent Jewels and Noble Jewels. Genève | 14 mai 2013 - www.sothebys.com