National jewelry and jade quality supervision and inspection center. Beijing Laboratory of National Jewellery and Jade Quality Supervision and Inspection Center (NGTC) is located atNo. Zhuang Road 19, Andingmenwai Street, Beijing. This institution is a gold, silver, jewelry and jade inspection institution authorized and approved by the Bureau of Quality and Technical Supervision according to law, and has a legal third-party impartial status. Its duty is to undertake compulsory supervision, spot check, entrusted inspection and arbitration inspection of the gold, silver, jewelry and jade market. At the same time, we can undertake various technical services such as consultation and training related to jewelry and jade.