AN ANTIQUE AMETHYST AND DIAMOND BANGLE

in 18ct gold and silver, set with three principal step-cut amethysts totalling c.29.30 carats, each surrounded by a border of old mine-cut diamonds held in pinched collet settings, all totalling c.8.0-9.0 carats, to a double hinged opening, secured with a tongue and groove clasp set with rose-cut diamonds, stamped '750', internal circumference c.18.5cm, (c.64.9g), accompanied by a fitted box