Platinum, 18 karat gold, emerald and diamond ring, Bulgari. Photo: Sotheby's.

Centered by a cushion-cut emerald weighing 10.20 carats, flanked by two half-moon-shaped diamonds weighing approximately 1.50 carats, size 5¾, signed Bulgari. Estimation 40,000 — 60,000 USD

Accompanied by SSEF report no. 43101 stating that the emerald is of Colombian origin, clarity enhancement: moderate, type: oil.

Sotheby's. Important Jewels. New York | 24 sept. 2013.  http://www.sothebys.com