An opal and diamond entourage ring in 18ct gold, centred with a precious opal cabochon of 12.8 x 10.6 mm and a high dome, displaying play-of-colour ranging from yellow to purple, encircled by twelve brilliant-cut diamonds of 2.5 mm wide, with dimensional shoulders ornated with floral and millgrain details, to a tapered D-profile shank, London hallmarked '750' with maker's mark 'GDC', 1975, ring size O, head measures 1.8 x 1.6 cm, total weight of item 9.7 grams.