Look at the steel seal in your gold ornaments. Is it GP or g, gold, pure gold? GP is gold plated. The other three are pure gold. If you buy pure gold jewelry, which is black after scraping and proves to be fake, you can call 123 15 to protect your legitimate rights and interests. If it's GP, covered with gold and plated with gold, it's not gold inside, but coated with a layer outside. This is a normal phenomenon. Yiduo jewelry solution.