Vintouch's 'Cosmo' rings are handmade by Italian artisans using ethically sourced and recycled materials. Cast from 18-karat gold-plated silver, this has a stylish hammered texture and it's centered with round blue Iolite - the birthstone for those born in the winter solstice. Gift it to someone special as a reminder of the power they hold within. Cast from 18 karat gold over Sterling Silver. (1-micron thickness). To protect gold-plating from natural oxidation, a 0. 10-micron palladium plate is applied before the gold-plating process. Palladium is an anti-oxidizing precious metal. We suggest avoiding contact with soaps, detergents, chlorine, and any other chemical substance that could alter the original characteristics of your jewel. When it is not worn, keep your jewelry piece in its bag in order to protect it from natural oxidation. Only if necessary, use a suede cloth and delicately clean the surface of the jewel. Made in full compliance with the UE Reach/Rohs directives and nickel-free so to avoid skin irritations.