An exceptional natural pearl and diamond necklace. Estimate CHF1,450,000 – CHF1,900,000 ($1,479,907 - $1,939,188). Photo Christie's Image Ltd 2015

The single-strand composed of thirty-seven slightly graduated natural pearls, measuring approximately 11.70 to 9.50 mm, to the marquise-cut diamond clasp, 43.0 cm, mounted in platinum and gold

Accompanied by report no. 78520 dated 4 March 2015 from the SSEF Swiss Gemmological Institute stating that 36 pearls are natural saltwater pearls, and that 1 pearl is a natural freshwater pearl. 

Christie's. GENEVA MAGNIFICENT JEWELS, 10 November 2015, Geneva