A fine natural pearl and diamond necklace. Price Realized CHF3,259,750 ($3,368,408). Photo Christie's Image Ltd 2013

The three strands composed of fifty-three, fifty-one and forty-nine natural pearls, measuring approximately 11.4 to 5.2 mm, to the diamond-set clasp, late 1930s, 43.0 cm - Estimate CHF400,000 - CHF600,000 ($420,893 - $631,340)

Accompanied by report no. 67270 dated 19 March 2013 from the SSEF Swiss Gemmological Institute stating that the 153 pearls are natural saltwater pearls 

CHRISTIE'S. MAGNIFICENT JEWELS, 15 May 2013, Geneva