Nowadays, jewelry stores generally do not issue certificates. Even if there is no certificate, it cannot be directly proved to be false. Zhou Dasheng and Lao Fengxiang have no certificates, but they are not fake. Only real gold or gold of standard purity can be found on it. For example, some slightly larger brands such as Qianjinjin and 999 also have their own brand names or logo. If not, there is probably a problem.