A pearl and diamond sautoir, by Boucheron

Of one-hundred and fifty-five graduated pearls, measuring from approximately 5.65 to 9.95 mm, joined by a marquise, circular and baguette-cut diamond clasp of foliate design, mounted in platinum, 50 ins. By Boucheron - Est. $250,000 - $450,000 - Sold $398,500

With report 1102469155 dated 29 December 2008 from the Gemological Institute of America stating that the pearls are natural saltwater pearls

Christie's. Jewels: The New York Sale. 22 April 2009. New York, Rockefeller Plaza www.christies.com Photo: Christie's Images Ltd 2009