Rhodium-Gold Plating

 
before
Rhodium is very white, reflective, extremely hard and virtually tarnish proof. Platinum on the other hand normally appears to be a more grayish white and not as bright which is why it is sometimes plated as well unless it has a good amount of palladium in the alloy.
after
BEFORE Rhodium Plating
 
AFTER Rhodium Plating