Depends on the person. Good watch (all metal, leather straps are incredibly tacky to my mind) and a wedding ring in general, no gemstones or anything, nice and subtle. I know many men who wear other rings (signet rings, thumb rings, one chap I know wears his mum's wedding ring on his little finger), some who wear chains, a couple with earrings, a few with bracelets, it all depends on the man, his build, the jewellery itself, the amount worn, etc. but that goes for women too. A man wearing a nice watch, a couple of tasteful rings and a chain that suits his overall build (bigger the bloke, thicker the chain) will look better than a woman in tons of cheap, overdone jewellery that doesn't suit her.