Natural pearl, emerald and diamond choker. Estimate 63,000 — 105,000 CHF. Photo Sotheby's

Composed of five rows of natural pearls measuring from approximately 4.05 to 4.70mm, decorated with a step-cut emerald within a double frame of cushion-shaped diamonds, highlighted with similarly cut diamond barrettes, shortest length approximately 345mm, French assay and maker's marks, emerald and diamond jewel detachable.

Accompanied by SSEF report no. 80046, stating that three hundred and ninety-eight pearls were found to be natural, saltwater, one was found to be cultured; and that the emerald on the clasp is of Colombian origin, with a minor amount of oil in fissures. 

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