Natural pearl and diamond brooch, 1920s. Photo Sotheby's 2011

Centring on a drop-shaped pearl within an octagonal frame millegrain-set with circular- and single-cut diamonds, French assay marks for platinum, frame 1920s. Lot 286. Estimate 15,000 — 20,000 GBP. Lot sold 56,450 GBP

Accompanied by The Gem & Pearl Laboratory report no. 04155, stating that the drop pearl was found to be natural, saltwater.

Sotheby's, Fine Jewels London, 13 Jul 2011