An Art Deco diamond and natural pearl brooch, 1920s

An Art Deco diamond and natural pearl brooch, 1920s, of bar design, with an openwork geometric pattern millegrain-set with round brilliant-cut and single-cut diamonds in platinum centred with a pearl, to a yellow gold pin, French maker's mark GM, French control mark, numbered 77993, length 9cm, case marked B Noury, Mauboussin

A verbal report from GCS states that the pearl is natural saltwater.