An amethyst and diamond halo ring, featuring an oval-cut amethyst of 11.7 x 9.8 x 5.8 mm, collet-set within a scalloped surround with millgrain edge, encrusted with an array of brilliant-cut diamonds, to a tapering flat-edged D-section shank, yellow metal marked '18ct', ring head measures 1.9 x 1.6 cm, ring size S, total weight of item 6.3 grams.