the centre claw-set with an emerald-cut emerald weighing approximately 3.05 carats, surrounded by millegrain-set Old European-cut diamonds, to a foliate surmount and four graduated diamonds, similarly-set with single and Old European-cut diamonds weighing approximately 2.00 carats, diamond-set bale, length approximately 45mm; on a fine trace-link chain, with bolt ring clasp, length approximately 420mm; cased