General authoritative state-owned jade appraisal center does not go to work on rest days.

The National Inspection Institute, affiliated to the Jewelry and Jade Jewelry Management Center of the Ministry of Land and Resources, is the maker of China's jewelry industry standards and the most authoritative testing institution, referred to as NGTC. Provincial inspection refers to the provincial jewelry and jade appraisal center. As for universities and third-party testing institutions, they are all set up by some universities specializing in jewelry or some private enterprises. However, due to personal reasons, the testing standards of these institutions will be lower. Of course, the cost of testing is cheaper than that of national inspection and provincial inspection, and merchants are willing to use it.