First, see whether the institution that issued the inspection certificate of jadeite jewelry has the right to issue the appraisal certificate. At present, the authorities of jadeite appraisal in Chinese mainland mainly include: National Jewellery and Jade Quality Supervision and Inspection Center (NGTC), which is the authority of jadeite inspection in China; China Quality Inspection Alliance Gold and Silver Jewelry Testing Center (CTA) is composed of dozens of national key provincial and municipal product quality supervision and inspection institutions, with branches in major provinces and cities across the country; The National Light Industry Jewelry Quality Supervision and Testing Center (GJC) is a metrological certification unit of the State Bureau of Quality and Technical Supervision. China Gemstone Association (GAC) is responsible for the quality supervision and inspection of self-regulated products in the national jewelry industry; Jewellery Testing and Research Center (GTC) of the Jewellery Chamber of the All-China Federation of Industry and Commerce, whose certificate has been recognized by dozens of countries in the world; GIC of China Geo University has trained thousands of technical backbones and hundreds of senior appraisers for jewelry quality inspection institutions and production, processing and wholesale units all over the country, and has been praised as "the cradle of treasure education" at home and abroad.