Art deco diamond brooch. Set to centre with one round old cut diamond in an open back rubover setting with an approximate weight of 0.85 carats, surrounded by 45 round old cut diamonds in open back grain settings with an approximate weight of 2.60 carats, adorned with 80 round eight cut diamonds in open back grain setting with an approximate weight of 1.60 carats, further set with six rectangular step cut diamonds in open back rubover settings with an approximate weight of 1.00 carats. The total approximate diamond weight is 6.05 carats, to a geometric design with intricate openwork, raised linear gallery with chenier detailing and pierced geometric backholing, fitted to reverse with a secure pin and safety catch, approximately 5.5cm in length. Marked platinum, French, indistinct makers mark, circa 1920.
