Where is the jewelry and jade appraisal center in Shenzhen or Guangzhou? (It can be available for national inspection or provincial inspection) Do you work on weekends and holidays?

Where is the jewelry and jade appraisal center of Shenzhen or Guangzhou (the national inspection or provincial inspection can be available) and the specific address? Do you go to work on weekends and holidays? Do they receive personal testing? How much does that cost? Intersection Intersection