An Art Deco Onyx and diamond pendant and chain

Description

rubover set old brilliant cut diamond, diameter 2.5mm, supporting a graduated articulated diamond set bar, terminating in a torpedo shaped cabochon onyx with an applied pierced diamond set (one lacking) spinning collar, length of pendant 4cm, unmarked, tested as 18ct gold and platinum, suspended from a trace link chain with a rectangular push-in clasp and figure of eight safety clasp, length 44cm, unmarked, tested as base metal, gross weight 3.1g