If it is steel seal, it is made by this company. If it is made by laser, it means that it is not made by this company.

YJ is the abbreviation of jewelry brand, and au9999 means that gold with a gold content of 99.99% is divided into pure gold and pure gold, with a gold content of 99.9% and 99% respectively. Pure gold, that is, 9999 gold, does not exist.