GIA is internationally recognized as the most authoritative certificate.
Secondly, we should pay attention to the diamond 4C, which usually determines the approximate value of a diamond on the GIA certificate.
Below is a picture of Zhihu.
The middle part of the left page
Carat weight: 1.03 carat weight: 1.03 carat.
Color grade: H color classification: H color scale?
Clarity grade: VS 1- Clarity grade: vs 1.
Cut?
Grade: excellent cut classification: perfect
The basic four items can roughly determine the price of your diamond.
Carat weight Carat weight, needless to say, this is the size of a diamond.
The highest color grade is D, and then there are E.F.G.H.I.J and so on.
The cleanliness level has the highest purity FL (flawless). Then there are IF (internal defect-free), VVS 1-VVS2 (minimum defect), VS 1-VS2 (minimum defect), SI 1-SI2 (defect) and I 1-.
Grade cut? The best is excellent perfection, followed by very good, good good, generally good, and poor. If you buy a loose diamond, the latter two are not considered.
There is a picture in the middle of GIA certificate, which will mark the location of drilling defects. Of course, the closer the defect is to both sides of the diamond, the better.
On the right page of GIA card, the normal range of parameters such as color, clarity and cut is clearly written.
Then there is this parameter that affects the price.
Fluorescent reaction: Fluorescent reaction refers to the reactive color light produced when diamonds are stimulated by external energy, usually under ultraviolet radiation.
According to its intensity, it is divided into five grades: none, weak, medium, strong and very strong. Weak does not record its fluorescence reaction color. ?
There are also some factors that are not written on the GIA certificate, but will affect the value of diamonds, such as the milk coffee green mentioned by some people. This is beside the point, so I won't expand it.
The above is the question of answering the Lord.
I hope it is useful to the subject, and don't be cheated when buying it.
If you want to ask the difference between customization and big brands in shopping malls, just ask.