Impressive emerald and diamond necklace, Harry Winston. Photo Sotheby's

Suspending three graduated pear-shaped emeralds weighing 10.61, 8.30 and 7.02 carats, surrounded by marquise- and pear-shaped diamonds, to a necklace set with pear- and marquise-shaped diamonds, the diamonds together weighing approximately 32.00 carats, mounted in platinum and 18 karat white gold, length approximately 415mm, signed. Estimate 5,000,000-6,000,000 HKD

NOTE: Accompanied by AGL reports numbered CS 45870 and CS 45871, dated 18 January 2012, stating that the 10.61 and 8.30 carat emeralds are natural, of Colombian origin, with indication of faint clarity enhancement; CS 45872, stating that the 7.02 carat emerald is natural, of Colombian origin, with indication of insignificant to faint clarity enhancement; also accompanied by a signed box and pouch.

Sotheby's. Magnificent Jewels and Jadeite. Hong Kong | 03 Apr 2012, 02:00 PM www.sothebys.com