An amethyst and diamond dress ring by David Jerome, set with a cushion-shaped amethyst in a four claw setting, the openwork shoulders of ribbon design and set with brilliant-cut diamonds, mounted in 18ct white gold, signed ‘David Jerome’, UK hallmark, ring size N½. £2,000-£2,600

Accompanied by a Report from International Gemological Laboratories confirming the cushion-cut amethyst is 14.46 carats, origin Brazil, with no indication of treatments or heat, total diamond weight of 0.39 carat, No J84012467EN, dated 8 April 2016.