According to The National Standard Commission there are about 80 laboratories and institutions in China issuing diamond certificates. The National Gemstone Testing Center (NGTC) is perceived as the most prominent lab in China and is authorized to inspect and check certificates issued by other labs. The National Standard on Diamond Grading is the only standard used in disputes or disagreements about appraisal results. Most retailers send their diamond (s) that are certified by foreign labs to the NGTC/its local affiliated labs to get it recertified in order to avoid disputes in the local market.
Useful links:
www.ngtc.gov.cn
www.cnsde.com
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