From a European princely family. Impressive natural pearl and diamond necklace. Estimate 295,000 — 585,000 CHF. Photo: Sotheby's.

Composed of a row of natural pearls measuring from approximately 5.15 to 12.20mm, alternating with seed pearls, on a pinched collet-set circular-cut diamond clasp, length approximately 640mm.

Accompanied by SSEF report no. 79509, stating that forty four pearls were found to be natural, saltwater, and one was found to be natural, freshwater. 

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