A three-strand natural pearl and diamond necklace. Photo Christie's Image Ltd 2014

Composed of sixty-one, sixty-one and fifty-nine white and light grey natural pearls, measuring approximately 15.6 to 5.1 mm, to the diamond-set clasp, mounted in platinum and gold, shortest strand 56.0 cm. Estimate CHF220,000 – CHF320,000 ($251,599 - $365,962)

Accompanied by report no. 55958 dated 21 March 2010 from the SSEF Swiss Gemmological Institute stating that the 181 pearls are natural saltwater pearls

Christie's. GENEVA MAGNIFICENT JEWELS. 14 May 2014, Geneva- http://www.christies.com/