My recommendation when wearing knuckle rings is to keep it simple. If you plan to wear a knuckle ring, don't load up your arms with chunky bangles or bracelets. And unless you're intentionally dressing like a ghetto girl or over-accessorized pop starlet, no hoop earrings.
Melody Ehsani, $50 & Made Her Think, $110
Lauren Ramirez, $190 & Bijules, $229-$250