Zhou Dasheng is a very good brand, and there are thousands of offline gold shops in China. As long as you buy a string in a regular store, you can really rest assured. As for the steel seal of the bracelet, it's only marked with gold, probably because I forgot to dial 999 when I left the factory, or it's just marked with gold and won't sell fakes. KMF999 engraved with steel seal refers to thousands of gold, also called Sanjiu gold. If the jewelry store is very formal, it can issue VAT invoices, and generally it will not be faked. Don't issue a receipt when you buy it, you'd better issue an invoice. Some businesses will issue receipts for customers in order to pay less taxes. Receipt and invoice are not the same thing.