A diamond brooch, 1950s, the pierced brooch of bow design, mounted with a central marquise-cut diamond weighing 4.18 carats, to the engraved foliate detail and diamond collet terminals, set throughout with single and circular-cut diamonds, remaining diamonds approximately 9.0 carats total, mounted in platinum, width 6.8 cm. Accompanied by a report from the Gemmological Institute of America (GIA) stating that the diamond weighing 4.18 carats is D colour, VVS2 clarity. Report number 1152339598, dated March 26th 2013