I can't remember how old this badge is, and it hasn't been worn for some time. I believe it is sterling silver, but I'm not 100% positive. When I got it out last week, I noticed it was "tarnished". I took it to a local jeweler to see if they could clean it. They brought it back a few minutes later and said they had tried three different processes, but couldn't get it clean.

Any one here have any ideas?