French Art Deco Diamond Coral Black Onyx and Platinum Brooch, Circa 1935, 1.02 Carats

A French Art Deco diamond, coral, black onyx and platinum brooch, with an open, circular centre, set with buff top black onyx, in a channel setting, with bow wings, grain set with eight-cut, old-cut and round brilliant-cut diamonds, buff top red coral and buff top black onyx, in channel and rub over settings, mounted in platinum, with millegrain edges, and open sided gallery and a pin and trombone safety catch, numbered 186, with a French dog head mark for platinum, circa 1935. The estimated total diamond weight is 1.02 carats.