An Art Deco blue sapphire and diamond plaque brooch, the open rectangular shaped platinum brooch collet set to the centre with an oval 1.52cts sapphire, surrounded by twenty grain set old cut diamonds weighing 0.30cts, having four diamond set cross bars linked with leaves totalling 0.68cts, the outer frame with thirty two collet set old cut diamonds totalling 0.76cts, all with millegrain finish and set with further diamonds, to a locking pin