A diamond and natural pearl brooch. Photo Christie's Image Ltd 2013

The drop shaped natural pearl to a fluted cusp and single-stone diamond surmount, 2.8cm long. Price Realized : $664,697

Accompanied by report no.67283 dated 18 March 2013 from The Swiss Gemmological Institute (SSEF), stating the pearl is natural, saltwater 

Provenance: Property of the Duchess of Genova and thence by decent to the present owner.

Christie's. JEWELLERY. 5 June 2013. London, King Street