Would a tungsten wedding band look OK w/ a gold ring w/ diamonds?
I would think not. Gold should go with gold, unless there is a tasteful mixing of gold and silver (or white gold or platinum) in the same ring setting. Also, a tungsten ring will “beat up” a gold band next to it. By itself, a tungsten ring would probably be all right . . . but I wouldn’t “mix and match” wedding/engagement rings!