Impressive Emerald and diamond necklace, by Cartier. Photo Sotheby's

Suspending to the front with two cushion-shaped emeralds weighing approximately 44.42 and 42.50 carats, surrounded by brilliant-cut diamonds, to a necklace composed of brilliant-cut diamonds, decorated at intervals with clusters of pear-shaped diamonds, the diamonds together weighing approximately 75.00 carats, mounted in platinum and 18 karat yellow gold, length approximately 430mm, signed and numbered HSS347. Estimate 8,000,000 — 10,000,000 HKD. LOT SOLD. 8,420,000 HKD 

Accompanied by Gübelin report numbered 11060062, dated 10 June 2011, stating that the 44.42 and 42.50 carat emeralds are natural, of Colombian origin, with indications of minor clarity enhancement. Natural emeralds are commonly clarity enhanced; also accompanied by a signed box.

Sotheby's. Magnificent Jewels and Jadeite. Hong Kong | 05 Oct 2011, www.sothebys.com