Lot 637. Attractive natural pearl, emerald and diamond brooch-pendant, circa 1925. Estimate 170,000 — 210,000 CHF. Lot sold 317,000 CHF. Photo Sotheby's 2013

The natural pearl drop measuring approximately 12.90 x 11.95 x 18.85mm, connected by a carved fluted emerald bead to an articulated surmount set with step-cut emeralds, cushion-shaped, circular-cut and baguette diamonds, pendant loops, detachable brooch fitting to reverse, French assay mark, accompanied by fine link chain highlighted with single-cut diamonds, length approximately 460mm. 

Accompanied by SSEF report no. 67811 and GIA report no. 11392645, stating that the pearl was found to be natural, saltwater. 

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 14 May 2013