Natural pearl and diamond necklace. Photo Sotheby's.

Composed of three graduated rows of natural pearls, measuring from approximately 5.00 to 8.45mm, the square clasp set with foil backed cushion-shaped and circular-cut diamonds, length of shortest row approximately 420mm. Estimation 45,000 -- 75,000 CHF

Accompanied by SSEF report no. 69924, stating that the one hundred and ninety-four pearls were found to be natural, saltwater.

Sotheby's. Magnificent Jewels. Geneva | 13 Nov 2013 -http://www.sothebys.com/