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Platinum, 18 karat gold, emerald, and diamond “Trefoil” brooch by Cartier. Photo Sotheby's

Set with three cabochon emeralds weighing a total of approximately 120.00 carats, framed and accented by numerous round diamonds weighing approximately 7.75 carats, signed Monture Cartier, numbered N5079, with French assay and workshop marks. Estimate 8,000,000 — 10,000,000 HKD. LOT SOLD. 8,420,000 HKD 

Sotheby's. Magnificent Jewels from the Collection of Mrs. Charles Wrightsman. New York | 05 Dec 2012 - www.sothebys.com