Opal and diamond ring, c. 1930, featuring an estimated 1.10ct opal matrix cabochon, claw set upon a platinum and 18ct white gold band and surrounded by fifteen rose cut diamonds, weighing an estimated total of 0.30ct, stamped 'Plat 18ct', 3.60 grams ring size N. Provenance: The Estate of Judith Hoyle, Newcastle, NSW