Natural pearl, cultured pearl and diamond necklace. Estimate 16,000 — 27,000 CHF. Photo Sotheby's

Composed of a graduated line of button shaped multi-coloured natural pearls and cultured pearls measuring from approximately 4.80 to 9.15mm, alternating with cushion-shaped diamonds, length approximately 350mm.

Accompanied by SSEF report no. 79771, stating that two pearls were found to be natural, saltwater, and that one pearl was found to be cultured; the remainder of the pearls have not been tested. 

Sotheby's. Magnificent Jewels and Noble Jewels. Genève, 12 mai 2015, 10:30 AM