Natural pearl and diamond necklace. Estimate 2,920,000 — 4,870,000 CHF. Photo: Sotheby's.

Composed of two graduated strands of seventy-eight natural pearls measuring from approximately 7.45 to 13.95mm, on a clasp set with a marquise-shaped diamond weighing 4.39 carats, framed with brilliant-cut diamonds, clasp signed Cartier, French assay and maker's marks, case stamped Cartier.

Accompanied by SSEF report no. 79686, stating that the seventy-eight pearls were found to be natural, saltwater.

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