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Why did my gold earrings turn green after a long period of time?

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I didn't store them in high humidity or anything. Just in room temperature. I just need to know if this is safe to use because my sister has an extreme sensitivity to stainless steel and cheap metals. We got her ears pierced a week ago and now today her earlobes are bleeding and are irritated. The first time we got her ears pierced, they got infected too and they closed. The only thing she can use are pure gold, hypoallergenic earrings. We thought 14k or white gold would suffice... I know this is a separate question as to the one above, but it goes highly related to the situation, but are there any suggestions as to how my sister can wear the earrings?