Lot 160. An exceptional two-strand natural pearl and diamond necklace. Estimate CHF800,000 – CHF1,200,000 ($841,899 - $1,262,849). Price realised CHF 785,000. © Christie's Image Ltd 2015

Composed of sixty-five and sixty-three natural pearls, measuring approximately 10.3 to 4.8 mm, to the marquise-cut diamond collet clasp, mounted in platinum and gold, 43.6 cm 

Accompanied by report no. 79095 dated 13 March 2015 from the SSEF Swiss Gemmological Institute stating that the 128 pearls are natural saltwater pearls, and an appendix letter for the 'Exceptional Natural Pearl Necklace' stating that ..'These natural pearls have been carefully selected and show a well matching round to roundish shape and a very fine pearl lustre.' 

Christie's. GENEVA MAGNIFICENT JEWELS, 13 May 2015, Geneva