Art Deco onyx, diamond and emerald brooch. Set with one hundred and six round old cut diamonds in open back grain settings with an approximate total weight of 10.00 carats, further set with twenty three rectangular baguette cut onyx in open back rubover settings, decorated further with two oval cabochon natural emeralds in open back rubover settings with an approximate total weight of 2.00 carats, to a symmetrical geometric brooch featuring polished borders, openwork details and intricately pierced backholing, fitted to reverse with a secure hinged pin and trombone clasp. Tested platinum, circa 1925, accompanied by fitted box.
