An opal and diamond dress ring, claw-set with an oval low-dome precious opal cabochon, displaying play-of-colour optical effects mainly ranging from green to purple on a light grey ground, approximately measuring 11.1 x 8.3 x 4.1 mm, single-cut diamond accents on shoulders, to a D-section shank, white metal stamped as 'PLAT 18', ring size N½, total weight of item 2.3 grams.