Genuine Natural Opal – Four round cut 2.5mm (0.10″) Natural Opals and three Brilliant Round cut 2.5mm (0.10″) Cubic Zirconia (Manmade Stone) weighing a total of 0.18ct. Each stone is individually selected and securely claw set in this ring by Expert English Jewellers. Each stone is unique so they have to be carefully selected to ensure they match in color and clarity. The contrast of the Opal and the sparkling Cubic Zirconia set against the Polished Sterling Silver is very eye catching indeed. Completely made from Solid English Sterling Silver Hallmarked by the London Assay Office which confirms the rings authenticity. The Hallmark includes the 925 marking plus the Leopards Head and the Royal Crown.