A large solid black opal and diamond cluster ring, platinum, made as a large oval shape modern cluster ring, featuring a flat, polished oval solid black opal, measuring 22 x 15.8 mm, weighing 12.50ct, displaying strong blue and green spectral colours throughout, claw set in an open back mount, framed by a surround of smaller brilliant cut diamonds with four larger featuring stones set, completed by a pave set diamond gallery, with wide diamond set shoulders of tapering profile. A.T.D.W.: 1.56ct.