Art Deco openwork diamond and emerald plaque brooch

Art Deco openwork diamond and emerald plaque brooch in platinum. Set throughout with round Old European cut diamonds, square carre cut diamonds and rectangular baguette cut diamonds in rubover, grain and channel settings, further decorated with four round cabochon cut emeralds in rubover terminals, fitted to reverse with a secure hinged pin and push barrel safety closure. Accompanied by original box.