There are many different ring materials which also reflect the personality of the individual. Titanium or Platinum are both becoming much more popular. Whilst diamonds are not, of course, as popular with men as with women, they do make a clear statement which pleases some men who choose them. Diamond men's rings clearly say "I can afford it" or at least the big ones do. But it can be a brave man who chooses to wear a large diamond band.
Which finger is the ring worn on, and why? Generally a man's wedding band is worn on the ring finger, the same as for women. The ring finger, for those unmarried men not familiar with the concept, is the fourth finger of the left hand. This is considered to be the finger closest to the heart.
Ultimately there are no rules about choosing a man wedding band. It is up to either the man or the couple together to make a decision. Will he or won't he. There are a variety of considerations. First, will he wear one? Once that decision is made in the affirmative then there is a whole world of choice about styles, widths, materials and the type of statement the ring makes, both for the man and the woman.
Generally though, even where the couple are to wear a matching ring set, the two rings are different. It is more common for the man's wedding ring to be wider than the woman's. This is because men's hands and women's hands are different. But once he has his ring on it is rare that he decides that he doesn't like it. And even if he doesn't, it is rare that the woman will let him take it off!