Diamond waist size is located on the diamond waist, usually with a frosted surface, and requires a magnifying glass to see clearly. The waist code is consistent with the code on the diamond certificate. In the process of selecting diamonds, it is necessary to check whether the diamond waist code matches the number on the GIA certificate.
How to check the quality of diamonds
1. GIA certificate identifies the authenticity of diamonds
The GIA certificate indicates the 4C (clarity, carat weight, color, cut) of the diamond. To confirm the authenticity of the certificate, you can check on the GIA official website. To confirm the authenticity of the certificate, you need to check whether the diamond waist size and diamond certificate are consistent.
2. NGTC certificate identifies the quality of diamonds
The NGTC certificate is an appraisal certificate issued by China's national jewelry and jade testing agency.
Compared to GIA, NGTC's testing standards tend to lean towards the color and clarity of diamonds.
On NGTC, the certificate number and anti-counterfeiting code will be marked, and there will also be a photo of the accessory. You can enter the anti-counterfeiting code on the official website to check the authenticity of the certificate.
Newcomers must purchase two complete certificates when choosing diamond rings. This kind of dual certification with one drill is basically the highest level of guarantee in China, and there will be no situation of passing off inferior products as good ones.