Elegant Diamond Necklace, by Cartier. Photo: Christie's Images Ltd 2014.

Designed as a series of graduated openwork old European and single-cut diamond swirling plaques, each centering upon collet-set old European-cut diamonds, to the old European and single-cut diamond square-shaped link backchain, mounted in platinum, 1942, 16 ins., in a Cartier red leather box. Signed Cartier. Estimate: $450,000 – $650,000

With a Certificate of Authenticity from Cartier

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