Diamond grades are divided ：
- Carat weight, diamond color grade, diamond clarity, diamond turn ratio, and symmetry, polishing, and fluorescent seven points
- Carat, Color, Clarity, Turner Cut" is called "Diamond 4C"
At ten times magnification, Accroding to ：Size, quantity, location, visibility and essence，determine the appearance and clarity of the diamond.。
|FL||Flawless||Flawless, observed with a 10x magnifying glass, without any clarity characteristics.|
|FL / IF||Internally Flawless||The highest level of diamonds. The surface features are minimally observed with a 10x magnifying glass.|
|VVS1, VVS2||Veryvery slightly included||In addition to the ideal FL/IF, the practical clarity of the diamond grade is the highest, quite clear.|
|VS1, VS2||Very slightly included||Diamond clarity VS2, VS1 or more, impurities are not visible to the naked eye, 10x magnifying glass is not easy to detect.|
|SI1, SI2||Slightly included||Diamond clarity SI1, SI2, impurities are not easy to see with the naked eye, 10x magnifying glass is easy to see.|
|lq , l2 , l3||Imperfect||Impurities are visible to the naked eye.|
The color of the diamond will vary depending on the trace elements contained. The color of the diamond is an important element that affects its value. The white diamond with the highest level of coloration should be transparent and colorless. GIA diamond color grade D is the whitest, the whiter the better. It is recommended to choose the diamond color D, E, F, G, H
|Very light yellow||O、P、Q、R|
One carat is equivalent to 200 mg (0.2 g) by weight. One carat can be subdivided to100 points for the calculation of finer diamonds; therefore, a 30-point diamond is 0.3 carats (0.06 grams) and a 50-point diamond is 0.5 carats (0.1 grams)
"Diamond 3Excellent" , Proportional, polished, symmetrical is close to the perfect proportion of the workmanship, the brightness and the diamond ratio is the best in the workmanship.
(Source: GIA China official website https://4cs.gia.edu/zh-cn)