2 thoughts on “Why does Zhou Dasheng Diamond Constellation Aurora 62 points have no GIA certificate? And only the NGTC certificate and IIDGR certificate? Why?”
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Why, simply that they did not do it;
gia, Institute of American, the formulator of the diamond 4C standard, one of the most authoritative appraisal agencies in the world, and the highest penetration rate in the field of diamond circulation. There is no one of the certificates. The price of diamonds is based on GIA's identification results as a reference;
NGTC, National Jewelry and Jade Quality Supervision and Inspection Center, belongs to the Jewelry and Jewelry Management Center of the Ministry of Land and Resources. Makers are the most authoritative appraisal agencies in China. There is no one, and the scale is slightly stricter than GIA;
iidgr, international diamond grading and research institution (
First, not all diamonds have certificates. Certificate is divided into international certificates and domestic certificates. Generally, international certificates are tested for nude stones, and domestic certificates are tested throughout the finished product. This is different. Then there are many international certificates. GIA is the most authoritative, and the judgment of quality standards is relatively stricter. Some other international certificates are much easier. Moreover, the certificate is required, and the GIA certificate is more expensive than others. Merchants will also consider costs.