The jewelry does not contain nickel. The metals of which they are composed - such as silver, copper, bronze and brass - can oxidize as they are not rhodium-plated and, depending on the ph of the skin, cause the appearance of a greenish halo which will disappear after a simple washing. , therefore, it is not an allergic reaction. Avoid using perfumes on enameled parts and pearls as they could be damaged. To bring the adjustable rings to size and prevent them from deforming, use the special cone tool that you will find in any jewelry.