Genuine Natural Opal – One large central Oval cut 8x6mm (0.32″x0.24″)Natural Opal and six round cut 2.5mm (0.1″) Cubic Zirconia (Manmade Stone) weighing a total of 0.30ct. Each stone is individually selected and securely claw set in this ring by Expert English Jewellers. 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.