-Oxidized silver finish over brass base -8mm Crystal Elements Care for your jewelry by simply wiping it down with a cotton cloth after wearing. Never wear the jewelry in water and put it on after you have already applied make-up, hairspray and lotion. Our jewelry has a patina finish that tends to darken over time. The best way to store your jewelry is with an anti-tarnish 3M square and away from Sterling jewelry that tends to oxidize more quickly.