2. Yes. Emerald is a mineral aggregate. To identify jadeite, you can go to Lincang Jade Quality Supervision and Testing Center, located in Nantian Road, Lincang.
The working hours of Yunnan Jade Appraisal Center are from 9 am to 6 pm. Yunnan Emerald Appraisal Center is located in Quality Supervision Building, No.76 Dongfeng East Road, Panlong District, Kunming. The jade appraisal institution is a full-time institution affiliated to the Market Supervision Administration, and its working hours are the same as those of public institutions. I don't go to work on Saturday and Sunday, and Monday to Friday is the best.
4. To identify jadeite, you can go to the local jewelry and jade quality supervision and testing center, which is more authoritative. In addition, in some jade crystal wholesale distribution centers, such as Sihui, Donghai and other cities, there will also be gem testing institutions.
5. China Metrology Certification Association consists of national or provincial metrological certification accreditation bodies and accredited metrological certification units. CAL is a nationally recognized testing institution. CNACL has passed the test of the national accreditation testing organization of China Laboratory.