Quality bijouterie. it does not contain nickel. it is anti-allergic. does not darken unless chemically touched. as long as it is kept away from perfume, soap, alcohol and similar chemicals, the usage time of the accessory is extended. a special protective coating has been applied on the product against allergies, oxidation and darkening. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.