Lot 514. From the Estate of Carroll Petrie. A Colombian emerald and diamond brooch, by Jean Schlumberger, Tiffany & Co. Estimate: $40,000 – $60,000. Photo Christie's Image Ltd 2015

entering upon a cabochon emerald, measuring approximately 34.00 x 28.70 x 18.46 mm, within an overlapping circular-cut diamond ribbon surround, 2 1/2 ins., mounted in platinum and 18k gold. Signed Tiffany & Co., Schlumberger, with maker's mark

Accompanied by report no. CS 71337 dated 29 October 2015 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of this emerald is Colombia, with minor clarity enhancement, traditional type

Notes: The cabochon emerald in this piece was originally the center element of a necklace, Lot 519

Christie's. MAGNIFICENT JEWELS, 10 December 2015, New York, Rockefeller Plaza