An emerald and diamond necklace, Harry Winston. Photo courtesy Bonhams

Designed as cut-cornered rectangular-cut emerald, weighing 13.45 carats, within a pear and marquise-cut diamond cluster surround, completed by a similarly designed necklace; necklace signed Winston, pendant signed HW for Harry Winston; with signed box; estimated total diamond weight: 32.00 carats; mounted in platinum and eighteen karat white gold; length: 16in. Estimate:  $180,000 – 280,000

Accompanied by AGL report #CS 39043, dated July 17, 2007, stating the emerald as: natural emerald, classic Columbian origin, with evidence of faint clarity enhancement: Organic (Oil Type.

Bonhams. 19 Jun 2013. New York. Fine Jewelry