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Sorry but Rolex WG is not covered/plated with anything. WG is derived by mixing YG with white metals like platinum and/or palladium. You can alloy YG by 25% and blend out most of the yellow color of gold but not all of it.
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Mike is right . They are not plated . The differences are subtle but visible . WG has a warmth to it , Platinium has a greyness to it which is why some companies rodium plat to make it look whiter . One problem is that there is no "standard " alloy for white gold . Other brands such as AP use a "white gold " that is more like a 'off yellow" so the plating is needed to change the colour . Platimiun is often plated because it is not "white and shiney" enough for some markets .