A South Sea cultured pearl and diamond dress ring by Mikimoto, from the ‘World of Creativity’ collection, the domed ring of radiating openwork design composed of four tapered brilliant-cut diamond set bands, centred with a golden cultured pearl, signed ‘MIKIMOTO’ and stamped ‘750’, total diamond weight approximately 1.02 carat, pearl diameter approximately 12mm, ring size N. £1,500-£2,000