Lot 566. Natural pearl and diamond hat pin, late 19th century. Estimate 100,000 — 200,000 CHF. Lot sold 140,500 CHF. Photo Sotheby's 2012

Set with a drop-shaped natural pearl measuring approximately 11.30 x 12.05 x 17.50mm, highlighted with circular-cut and rose diamonds, length approximately 105mm, French assay and partial maker's marks. 

Accompanied by SSEF report no. 62973, stating that the pearl was found to be natural, saltwater.

Jewels from the collection of Princess Frances Alice Poniatowska (1901-1989), née Willing Lawrance.

Sotheby's. Magnificent Jewels Geneva | 14 Nov 2012