will 'wear off' after a certain time, (though of course it will). The issue is, you're paying for 'white gold' and you're not getting white gold. You're getting, instead, a plated case of who-knows-what? I submit that it does not matter what the underlying metal is: You can't see it, you can't touch it, and when, (not if), the plating wears through, the case is ruined anyway, and must be replated. It may as well be lead beneath that Rhodium for all it really matters in the long run.
For that matter, why bother with going through the motions of mixing up an alloy of 'white' gold if it's just going to be plated anyway? Why not just use yellow gold to start with if you need to believe it's gold underneath. Plated is plated, end of story, and they can keep it as far as I'm concerned.
Apologies if this comes off as a 'rant'. >;^)