Emerald and diamond ring, Bulgari. Photo courtesy Sotheby's

The step-cut emerald weighing 5.40 carats, framed with brilliant-cut diamonds and triangular and tapered baguette diamond shoulders, signed Bulgari, ring size 53. 

Accompanied by SSEF report no. 69318, stating that the emerald is of Colombian origin, with a minor amount of oil in fissures.