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Isn't that the kind of thing you worry about before you buy a rose gold watch?
OP, I would not worry too much about this. I like matching my wedding band with the watch, but IMHO taking the belt buckle into consideration takes it to a whole new level. Also, as an owner of a sophisticated timepiece you get a free pass. If anything I'd say that rose gold with high polish steel looks better than yellow gold with the same. (In general, I am not a fan of yellow gold at all.)
If in doubt, invest into pants you can wear with proper suspenders. Problem solved :)