Classic Diana Ring made with lab created Synthetic Blue Sapphire and best 5A quality cubic zirconia. Synthetic sapphire stone we have used is of exact same cut, color and quality as of natural blue sapphire stone. Blue Sapphire Cut - 9 mm x 11 mm All of our products are 100% skin-friendly and eco-friendly, hypoallergenic, does not contain nickel, cadmium, or lead. Base metal is guaranteed silver 925, stamped and marked and is real 18k gold filled which is very durable and stays for years. Gold Filling is completely different from Gold Plating as gold filling contains 100% gold which does not go away easily and enhances the life and look of the jewelry.