Lot 498. Natural pearl and diamond necklace. Estimation 2,920,000 — 4,870,000 CHF. Lot sold 6,522,000 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.

Illustrated with four additional cultured pearls which have been subsequently removed.  

Accompanied by SSEF report no. 79686, stating that the seventy-eight pearls were found to be natural, saltwater; together with an appendix letter mentioning the remarkable size and highly matching appearance of the pearls. 

Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 12 mai 2015