An emerald and diamond brooch

An emerald and diamond brooch, of openwork foliate design, set with a central round brilliant-cut diamond and four pear-shaped emeralds, with further circular-cut diamonds to the mount in platinum, scratched inventory number JA3949, 3.5cm wide

Accompanied by report number 81311-82 from GCS stating that the four pear-shaped emeralds are natural emeralds, with indications of minor to moderate clarity enhancement, origin Colombia (3) and Zambia (1)