I love my tungsten rings. I have two of them. Having gotten the second ring from www.sparklecartel.com for crazy cheap, I now check daily for tungsten rings. They offer them frequently. While I was in Nebraska, I saw another ring I liked. I ordered it. It’s completely smooth. This will definitely test the “not-able-to-be-scratched” claim of tungsten.
How many rings is too many? In the name of science, I’m going to try to find out.