A pair of natural pearl and diamond ear clips, by Van Cleef & Arpels. Photo Christie's Image Ltd 2013

One clip centering upon a white button-shaped natural pearl, weighing approximately 21.64 grains, one clip centering upon a brown button-shaped natural pearl, weighing approximately 21.26 grains, each with a brilliant-cut diamond surround and marquise-shaped diamond border, mounted in platinum, 2.5 cm. Signed Van Cleef & Arpels, no. NY15501. Estimate:  $21,577 – $30,208

Accompanied by report no. 66729 dated 21 February 2013 from the SSEF Swiss Gemmological Institute stating that both pearls are natural saltwater pearls, the brown pearl with no indications of artificial colour modification

Christie's. MAGNIFICENT JEWELS. 15 May 2013. Geneva. www.christies.com