* National Jewelry and Jade Quality Supervision and Inspection Center (ngtc): This institution has rich experience and advanced technology, and can provide professional jewelry appraisal services.
* Beijing Zhong Da Jewelry Appraisal Center: This institution has a high reputation and good reputation, and can provide accurate and reliable jewelry appraisal services for customers.
Beijing Zhongwei Jewelry and Jade Quality Testing Center: This institution has rich experience in jewelry appraisal and can provide customers with professional testing and evaluation services.
Generally speaking, these institutions have good reputation and service quality. You can choose one of them to meet your needs. When conducting jewelry appraisal, it is necessary to pay attention to the selection of formal appraisal institutions and ensure that appraisers have relevant professional knowledge and experience. At the same time, the cost of appraisal institutions also needs to be evaluated and selected according to the specific situation. Please note that the above information is for reference only. If you need specific advice, please seek the help of professionals.