Two precious opal dress rings; to include a five-stone half-hoop ring in 18ct yellow gold, with five graduated oval opal cabochons in a coronet setting, hallmarked '18' with maker's mark 'DM', size N½; together with a precious opal solitaire, containing an oval-shaped precious opal panel of 12.7 x 10.5 x 4.0 mm, displaying strong play-of-colour mainly ranging green to purple, against a greyish blue ground, claw-set to a low-profile mount, flat shank testing 9ct, size J; Total weight of items 5.5 grams (2).