18ct white gold and diamond brooch, circa 1920. Property from a private Sydney Collector. Designed as an oval plaque centring an old European-cut diamond weighing approximately 1.64 carats, collet-set within a pierced and millegrain-set surround accented with collet and bead-set circular-cut diamonds together weighing approximately 3.67 carats, length 38 mm, width 32 mm, gross weight approximately 10.8 grams.