Lot 494. Property of Mary Duchess of Roxburghe. Pair of natural pearl and diamond earrings, Cartier, circa 1935. Estimate 39,000 — 69,000 CHF. Lot sold 394,000 CHF. Photo Sotheby's. 

Each of chandelier design, set with light brownish grey to greyish brown natural pearls measuring from approximately 6.75 x 6.95mm to 9.45 x 9.55mm, highlighted with circular- and single-cut diamonds, unsigned, post and butterfly fittings. 

Accompanied by SSEF report no. 79525, stating that the eight pearls were found to be natural, saltwater, with no indications of artificial colour modification.. 

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