What certificate is the most authoritative for diamonds?
Diamond certificates are mainly divided into international diamond certificates and domestic diamond certificates. Among them, GIA American Gemological Institute and IGI International Gemological Institute are the most authoritative foreign diamond certificates, which have been adopted by major international jewelers. The diamond certificate issued by NGTC National Pearl and Jade Quality Supervision and Inspection Center is an authoritative institution in China, and the organization of NGTC diamond certificate belongs to the Ministry of Land and Resources, which is a stricter and more authoritative diamond appraisal institution in China.
What kinds of diamond certificates are there?
At present, internationally recognized diamond certificates mainly include lGl, GlA, HRD, AGS, EGL and NGTC.
If we want to compare the authority of the diamond certificate, GlA has a five-star rating, and lGl and HRD also have a five-star rating. These three institutions are authoritative internationally. At present, most international diamond grading standards are jointly maintained by these three institutions, and their certificates are widely recognized all over the world.
Common types of diamond certificates
1.NGTC diamond grading certificate, issued by the National Jewelry and Jade Quality Inspection Supervision and Inspection Center. You can tell by the name that this certificate shows that this diamond has passed the standards of our country. The National Jewelry and Jade Quality Supervision and Inspection Center is a professional jewelry and jade quality inspection institution authorized by the relevant state departments according to law.
2.GIA diamond grade certificate is a certificate issued by American Gemological Institute. American Gemological Institute has considerable authority in the world jewelry industry. It is an independent non-profit organization, but its diamond classification report is considered to be the first gem certificate in the world.
3.IGI diamond grade certificate is a certificate issued by the National Gemological Institute. National Gemological Institute is the oldest gemological institute in the world, and its diamond certificate authority is also recognized by all countries in the world, which is also a certificate to prove the authenticity and accurate diamond grade of diamonds.
What about the diamond certificate?
The first step is to see whether the issuing institution of the certificate is a national inspection certificate or an international diamond certificate. Usually, the international diamond certificate will be more mobile. That depends on the date of the certificate. When buying rough stones, you can choose the diamond with an earlier certificate date, because a diamond has only one certificate and the time is relatively new, so it proves that the appraisal time of this diamond is relatively close, and the probability of encountering second-hand diamonds is relatively small.
Step two, look at the laser code of the diamond. There is a unique laser code on the waist of the diamond. With this, you can know whether your diamonds are the same as those on the diamond certificate. It also depends on the code of the diamond certificate, which can be used to check the diamond certificate at night.