An antique Australian 18ct yellow and white gold opal and diamond ring by Catanach, one oval solid white opal with red blue play of colour, measuring 14.5 x 8.2 mm, 3.00ct with sixteen semi old European cut diamonds, 1.60ct in total, colour F, clarity VS. Made by Catanach Jewellers, Melbourne, circa 1920. Size N1/2. Total weight 6.3grams.