Lot 1775. 10.35 carats Colombian Emerald and Diamond Ring. Estimate 820,000 — 960,000 HKD. Lot sold 1,100,000 HKD. Photo: Sotheby's 2011.

Centring on a cushion-shaped emerald weighing 10.35 carats, surrounded by oval diamonds, highlighted by circular-cut emeralds, the shoulders pavé-set with brilliant-cut diamonds, the diamonds together weighing approximately 4.90 carats, mounted in platinum. 

Ring size: 5¾

Accompanied by Gübelin report numbered 0608617, dated 23 August 2006, stating that the 10.35 carat emerald is natural, of Colombian origin, with indications of minor clarity enhancement. Natural emeralds are commonly clarity enhanced.

Sotheby's. Jewels and Jadeite, Hong Kong, 06 Apr 2011