1. The four criteria that determine the quality of a diamond are color, clarity, weight and cut, which are usually called the "4c" grade of a diamond. The higher the grade of diamond, the more expensive it is.
2. Diamond color: Diamond color * * has 1 1 species, which can be divided into five colors: D-F (colorless), G-J (nearly colorless), K-L (yellowish), N-R (yellowish) and S-Z (yellowish). Colorless diamonds are best.
3. Diamond clarity: Diamond clarity can be divided into FL, VVS 1, VVS2, VS 1, VS2, SI 1, SI2, P 1, P2 and P3 10. When buying diamonds, it is best to be above the VS clarity level.
FL: Flawless-when observed by professionals under the magnification of 10, there are no flaws inside and outside, which is the rarest and most precious among all cleanliness levels.
Two ifs: there is no flaw inside-when professionals look at the magnification of 10, there is no flaw inside, but there are tiny flaws on the diamond surface.
VVS 1: Very tiny flaw1-Only one tiny flaw was observed by professionals at the magnification of 10.
Iv VVS2: minor defect level 2-individual minor defects were observed by professionals at the magnification of 10.
V VS 1: microcrack 1- 10 times magnification, a single microcrack can be seen.
Six VS2: Micro-defect level 2- 10 times magnification, you can see several micro-defects.
Seven SI 1: small flaws1-10 times magnification, obvious flaws are easy to observe.
Eight SI2: Small defect level is 2- 10 times magnification, and several obvious defects are easy to observe.
4. Weight of diamond: The weight unit of diamond is carat, 1 carat = 0.2g = 100 minutes. It is suggested that the diamond ring can be selected between 50 points and 100 points according to personal circumstances.
5, diamond cutting: good cutting can perfectly reflect the brightness and fire color of diamonds.
One cut: This includes all diamonds that do not meet the general cutting standards. These diamonds are cut deep and narrow, or shallow and wide, and light can easily escape from the edge or bottom.
General cutting: represents the cutting of diamonds, with a roughness of 35%. Although it is still a high-quality diamond, the light reflected by the diamond is not as good as that of the G-cut.
Three kinds of good cutting: about 25% of diamond cutting. It is the diamond that reflects most of the light that enters the diamond. Much cheaper than VG.
Very good cut: represents about 15% of the diamond cut. It can make diamonds reflect the light of standard grade cutting, but the price is not high.
Ideal cut: only 3% of the first-class high-quality diamonds can meet the standard. This kind of cutting makes the diamond reflect almost all the light entering the diamond, which is an elegant and outstanding cutting.