Conch pearl and diamond necklace. Photo Sotheby's

Suspending a conch pearl drop, to a surmount set with princess-cut diamonds and another conch pearl, to a fine chain spectacle-set with brilliant-cut diamonds, length approximately 425mm. Estimate 5,000 — 7,000 GPB. Lot sold 7,500 GBP. 

Sotheby's. Important Jewels, London, 17 Dec 2008