I want to identify emerald and silverware, Jiangsu Provincial Quality and Technical Supervision Jewelry Jewelry Product Quality Inspection Station and Nanjing National Gold and Silver Products Quality Supervision and Inspection

I want to identify emerald and silverware, which is more authoritative of Jiangsu Quality and Technical Supervision Jewelry Products Quality Inspection Station and Nanjing National Gold and Silver Quality Supervision and Inspection Center? The test results are more formal? Solve! please!

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