White gold can turn your skin black / gray?

I have a white gold necklace that I have taken over the past year and a half. is starting to gray back to my neck in which pendant lies. never done this before, why now? White gold can do that? What is the cause? thanks

Be cleaned with a jewelry cleaner. My jewelry makes when you have not worn in a while and needs to be cleaned. Otherwise, it does not happen.

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