Check the symbol of Leofoo gold. Generally engraved with 999 or 990 or 10K, 18K, 22K, 24K. Don't take it below 10K, because the gold content is too low. Laojin jewelry did not obviously lie about the official purity mark. Of course, fake gold ornaments will also have official signs, so further inspection is needed. 2. Leofoo gold ring will have a "CLF" logo inside, which is the logo of Leofoo brand. It comes from the initials of the pinyin "Leofoo", and C also stands for China. In addition, the Leofoo gold ring will have a certificate tested by relevant international departments when it is purchased, and it must be seen whether it is standardized. 3, you can go to the local authoritative jewelry testing institutions or technical supervision bureau for testing. Their products have the logo and gold seal of Leofoo, which provides quality assurance. Their official WeChat account also has the function of anti-counterfeiting inquiry.