Many years ago, the jewelry testing center in Fujian was more authoritative, but now it is not working. Now many of them are commercialized, and many appraisal centers cooperate with local commercial companies and are protected by local governments. Therefore, in order to protect the loss of local Tianhuang, the testing center in Fujian is becoming more and more unpopular.

I found it on Baidu, the jewelry testing center of China Geo University, which is also world-famous. I had the honor to communicate with a world-class master of seal cutting (Professor Bin Song of China Geo University). I understand that their standards are "fairness", "justice" and "thirst for truth". At the same time, it is easy to understand that this glorious old professor is not good at being famous.

The above are purely personal opinions and are for reference only.