NGTC； CNACL .NGTC is one of the most authoritative jade certificates, which is formulated by the Jewelry and Jade Jewelry Management Center of the Ministry of Land and Resources and belongs to the national nature certification certificate. Jade certificate is the certificate provided by NGTC certificate in the products of Colorful Yunnan Store.

CNACL is a nationally recognized testing institution, China Laboratory, so its certificate is authoritative.