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

Composed of ninety-eight, ninety-six, ninety-two, eighty-eight, and eighty-six natural pearls, measuring approximately 10.4 to 3.8 mm, with two diamond bar spacers, to the openwork diamond-set elongated clasp, mounted in gold, 51.7 cm. Estimate CHF540,000 – CHF720,000 ($617,561 - $823,415)

Accompanied by report no. 71896 dated 16 December 2013 from the SSEF Swiss Gemmological Institute stating that the 460 pearls are natural saltwater pearls