Ordinary. Shenzhen Zhongzhi Jewelry Testing Center is a third-party professional testing and inspection institution authorized by relevant state departments according to law. It has passed China Metrology Certification (CMA) and National Accreditation Committee for Accreditation of Conformity Assessment Laboratories (CNAS) in China. It is a formal company, and its business scope includes licensed projects, all of which are formal and within the scope permitted by law.