A Belle Époque natural pearl and diamond brooch-pendant. Estimate CHF220,000 – CHF330,000 ($221,875 - $332,813). Photo Christie's Image Ltd 2015

The drop-shaped natural pearl, measuring approximately 12.80-13.55 x 23.00 mm, within a rose-cut diamond foliate frame, interspersed with three old-cut diamond collets, suspended from the similarly-set bar pin, circa 1910, 4.8 cm

Accompanied by report no. 81361 dated 5 August 2015 from the SSEF Swiss Gemmological Institute stating that the pearl is a natural saltwater pearl. 

Christie's. GENEVA MAGNIFICENT JEWELS, 10 November 2015, Geneva