Natural pearl and diamond necklace, late 19th century. Estimate 10,000 — 15,000 GBP. Photo Sotheby's

The pendant of stylised foliate design, set with baroque natural pearls of various colours and millegrain collet-set with circular-cut and cushion-shaped diamonds, suspended from a similarly-set necklace, length approximately 460mm, two pearls deficient. 

Accompanied by The Gem & Pearl Laboratory report no. 09212, stating that the four pearls tested were found to be natural, saltwater.

Sotheby's. Fine Jewels London, 18 Mar 2015, 10:30 AM