The center has CMA, CAL and CNAS inspection qualification certificates, and is an impartial and independent third-party gold, silver and jewelry testing laboratory. Reports and certificates issued by the center have legal effect. Gdtc appraisal certificate is a certificate issued by a completely formal and legal appraisal institution, which has legal benefits, is a completely true and effective certificate and is recognized by the state. GDTC is also a diamond certificate issued by GDTC diamond testing agency.