NGTC certificate, full name of National Jewelry and Jade Quality Supervision and Inspection Center, belongs to the certification certificate produced in China. For ngtc certificate, it is not only the inspection of bare diamonds, but also the inspection of finished jewelry inlaid with diamonds such as diamond bracelets.
GTC certificate belongs to the Jewelry and Jade Jewelry Management Center of the Ministry of Land and Resources, and has long been committed to the promotion and popularization of jewelry vocational education and national jewelry and jade standards.