The time detection time of ngtc certificate is three working days. Except Saturday, Sunday and legal holidays, special samples shall be determined separately. The detection scope includes jewelry and jade identification, diamond 4C classification, precious metal purity detection, etc. National Jewelry Inspection (NGTC) is a department-level institution directly under the Ministry of Natural Resources, and a national-level jewelry and jade quality inspection institution authorized by the State Administration of Market Supervision according to law.

Definition of ngtc and types of certificates issued

NGTC 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.

Jewelry and jade jewelry appraisal certificate is applicable to the identification and naming of all kinds of jewelry and jade. The appraisal certificate of high-grade jewelry and jade jewelry is applicable to the naming of high-grade jewelry and jade, such as samples or ornaments with high value and difficult inspection.

The Certificate of Grading and Appraisal of Inlaid Diamonds is applicable to inlaid polished diamonds with a mass greater than 0.04g or 20ct. Diamond grading report, applicable to natural non-inlaid polished diamonds with a mass of 0.04g to 0.20g. Diamond grading certificate, applicable to natural non-inlaid polished diamonds with a mass of more than 0.04g or 20ct. Certificate of purity appraisal of precious metal ornaments, which is applicable to the purity inspection of precious metals.