An opal and diamond entourage ring in 18ct gold, featuring an oval precious opal cabochon of 9.2 x 5.8 x 3.1 mm, displaying strong spectral play-of-colour optical effects on a light translucent ground, encompassed with twelve brilliant-cut 2.6 mm diamonds, to tapering shoulders and D-section shank, London hallmarked '750', 1977, ring size N, cased with papers, total weight of item 4.3 grams.