TVD jewelry is made from solid copper or sterling silver. We use a type of sterling called “Argentium” which is tarnish-resistant. Woohoo!
To clean it you can use any standard silver polish or polishing cloth. My favorite is Goddard’s silver polish.
The copper may have a patina applied–if so, just clean it up with soap and water. Copper without a patina can be cleaned with any copper or brass polish.