AN ART DECO DIAMOND PLAQUE BROOCH, CIRCA 1930 the stylised rectangular body of openwork design, centring a hexagonal motif set with an old European cut diamond between two baguette cut diamonds and within a border of old cut diamonds, accented throughout by further old cut diamonds, the diamonds all totalling 3.6-4.2 carats, no assay marks, 4.4cm, 8.3g.