Lot 406. A Rare Platinum, Natural Pearl and Diamond Necklace. Estimate 600,000 — 800,000 USD. Photo Sotheby's

The double-strand necklace of graduated design, composed of 138 natural pearls measuring approximately 9.8 to 4.8 mm, the clasp centering an emerald-cut diamond weighing approximately 1.40 carats, accented by round diamonds weighing approximately .35 carat, length 17½ inches, the clasp signed Cartier London.