It is natural for all metals to oxidize with exposure to air. To ensure that your cuff links stay bright for a longer time, please keep it in an air-tight bag. In the case that your cuff links do tarnish, you can restore shine by polishing with a polishing cloth. Please DO NOT use solvents, harsh chemicals, or sonicators. We recommend Connoisseur's Polishing Cloths for silver or gold. Most polishing cloths come with an inner microabrasive-treated cloth and an outer gentle buffing cloth.