An opal and diamond cluster ring, the oval cabochon-cut opal within a navette-shaped surround of brilliant-cut diamonds, with pierced and scrolled gallery, between diamond-set shoulders, mounted in 18ct gold, UK hallmark, signed ‘Luke Stockley’, opal approximately 20.0 x 11.5mm, total diamond weight approximately 1.00 carat, ring size L½. £1,000-£1,500