A turquoise, sapphire and diamond brooch, by Van Cleef & Arpels. Photo Christie's Image Ltd 2013

Set with an oval cabochon turquoise, within a circular-cut sapphire and diamond sculpted surround, mounted in 18k gold, with maker's mark, accompanied by an attachable 18k gold fine link neckchain by Van Cleef & Arpels, 15½ ins. Signed Van Cleef & Arpels, N.Y., no. 35876. Estimate $8,000 – $12,000

Christie's. NEW YORK MAGNIFICENT JEWELS AND THE PRINCIE DIAMOND. 16 April 2013. New York, Rockefeller Plaza.