An emerald and diamond earring and ring, by Van Cleef & Arpels. Photo Christie's Image Ltd 2014.

Comprising a ring, set with a rectangular-cut emerald, weighing approximately 12.65 carats, within a two-tiered circular-cut diamond surround, to the circular-cut diamond shoulders; and an ear clip, set with a rectangular-cut emerald, weighing approximately 9.86 carats within a two-tiered circular-cut diamond surround; mounted in platinum and gold, in a Van Cleef & Arpels brown suede envelope. Each signed Van Cleef & Arpels, N.Y., no. 3520 S.O. (Special Order). Estimate 30,000 – $50,000

Christie's. MAGNIFICENT JEWELS, 16 April 2014, New York, Rockefeller Plaza -www.christies.com