Hello, this is not necessarily true. I go to the jewelry show every year. Many merchants ask for jade at will. This needs to be cut by people in the industry who know the market, but people in the industry generally don't go to jewelry exhibitions to buy it. Before buying a jade bracelet, my friend found that it was dyed with polishing powder. If you don't know the identification, try not to buy it. If I could get the certificate at that time, otherwise the merchants would not be able to find it anywhere after buying the jewelry exhibition.