A solid crystal opal and diamond cluster ring, 18ct yellow and white gold, crafted as a large oval cluster dress ring of classic proportion, featuring a central cabochon high domed crystal opal weighing approximately 8.20ct, vibrant rolling spectral colours of orange, green, red and aqua throughout, bezel set in yellow gold in an open backed mount, framed by sixteen brilliant cut diamonds totalling approximately 1.50ct, white gold scalloped edges, set to a gold band.