Designed as a coiled snake, decorated with blue guilloché enamel, the head set with a pear-shaped moonstone cabochon within a surround of old brilliant and rose-cut diamonds, the eyes set with circular-cut rubies, the hinges highlighted with rose-cut diamonds, the ring sprung and of similar design, mounted in gold, inner diameter approx. 5.2cm (adjustable), ring size P, ring cased by Cameo Corner, 26 Museum Street, London (2)