Generally black rings with a black scope whether the rifle is stainless or blued. Don't own a silver scope.
Exceptions being if the silver rings come with the rifle, like they did with my stainless Hawkeyes and the Tikka. In those cases I just use their silver rings.
Even with the black scopes I've been known to match matte rings with a gloss scope or vice versa if that's what I had on hand.
Overall, though, it's not something that keeps me up at night. I'll admit that it used to, but not anymore.
