A collection of jewellery

A collection of jewellery, comprising: a single row cultured pearl necklace, the clasp set with circular-cut sapphires, stamped 585; a ring set with step-cut blue topazes and accented with single-cut diamonds, size M1/2, British import hallmarks for 9ct gold; a 9ct gold band of ridged design, size J1/2, British hallmarks; and a ring set with a cushion-shaped citrine within a rope twist border, size N1/2, British hallmarks for 9ct gold