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並前往https://www.ftc.gov/news-events/news/press-releases/2010/12/ftc-revises-jewelry-guides-reflect-use-base-metal-alloys-platinum-jewelry

FTC Revises Jewelry Guides to Reflect the Use of Base Metal ...

In recent years, some marketers have added base metals, such as copper and cobalt, to platinum jewelry sold to consumers.

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