Tungsten or Ti were my "cool" ring choices until I realized how much I metalwork. Slag sticks to both, my buddy ruined his ti ring tack welding and grinding without gloves. Grabbing metal objects quickly or falling on pavement will shatter tungsten rings, more strikes for me. I went with gold, polishes back up and doesn't tarnish.
That would be awesome if your wife is a dude, if not buy her a real wedding band.