Art Deco platinum sapphire and diamond brooch, designed as a large plaque, with fine open work saw piercing set with mill grain rose cut diamonds and old mine cut diamonds, mill grain set in the centre with a square emerald cut deep blue sapphire, unstamped, total weight 12.20grams, sapphire 2.2cts, diamond approx. 1.5cts, length 5.5 cm, burgundy box