merkaba jewelry wholesale What are the four major authoritative certification agencies of diamond certificates?

cyrus jewelry wholesale GIA, IGI, HRD and NGTC certificates are the most authoritative four certificates of diamonds.
The diamond certificates are four main types, namely GIA certificates, IGI certificates, HRD certificates, and NGTC certificates. Among them, the GIA certificate, IGI certificate, and HRD certificate are international diamond -level appraisal certificates, and the NGTC certificate is a mainstream diamond -level appraisal certificate in China, known as the national inspection certificate. These four international diamonds can be universal globally, and only identify bare diamonds.
Diamond precautions
The wrap of the diamond not only depends on the type, but also depends on the size and location. Some diamonds are cheap because of the influence of the bodies. Just solve everything.
The black bodies and feather cracks in the natural diamond parcel are relatively avoided, because the black bag can directly block the spread of light, which will affect the fire color and color of the diamond. The feathers have an impact on the durability of diamonds. If the diamond is cracking or at the waist bodium, there is a risk of cracking. Of course, the position is also very important. The position of the parcel should not appear on the table as much as possible. It is better to approach the waist edges. Except for the 羽 当 当.