Mid Century Old Cut Diamond & Onyx Pin Brooch, circa 1960A terrific vintage brooch with clear influences from the Art Deco period. The old cut diamond in the centre is set within a milgrained square platinum setting, with sits within a panel of satin finished white gold. Two bars of onyx angle away from the centre panel, stepping down to a box set rose cut diamond which conforms to a slender, 18k white gold pin. Secured with a trombone clasp. Item # 79511S019 S019