Lot 1635. 18.00 carats Colombian emerald and diamond ring. Estimate 2,000,000 — 2,800,000 HKD. Lot sold 3,140,000 HKD. Photo: Sotheby's 2011.

Centring on a step-cut emerald weighing approximately 18.00 carats, flanked on each side by a trilliant diamond together weighing approximately 3.00 carats, mounted in 18 karat white gold.

Ring size: 6¾

Accompanied by SSEF report numbered 58180, dated 11 January 2011, stating that the 18.00 carat emerald is natural, of Colombian origin, with no indication of clarity modification; also accompanied by an appendix stating that the emerald "exhibits an outstanding transparency and a well-saturated green colour... Natural emeralds from Colombia of this size and quality represent a great rarity and the described gemstone is thus a very exceptional treasure."

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