All sterling silver is treated with Renaissance wax which will in normal circumstances provide a gentle protective layer and provide tarnish resistance. If tarnish does present the wax will not impede conventional methods of cleaning and polishing. The gold discs may need a clean up every now and then.
Resin is sensitive! It doesn’t like to be treated rough and may scratch or mark. It also needs some protection from direct sunlight for extended periods. Normal wear is fine.