How to judge the 4c standard of diamonds;
1, diamond color classification. Diamonds are first divided into colored diamond and white diamonds, among which red, pink, blue and green are more precious and rare. The most common ones are white diamonds and yellow diamonds. The purer the diamond color, the higher the transparency and the higher the price. Under the magnifying glass, diamonds have many colors. Taking white diamonds as an example, 100 point color diamonds are rated as D and 99 point color E, etc. Until J-class white diamonds are still called naked-eye white diamonds, and K-class and below white diamonds are called non-white diamonds. Where D≤F is colorless and G≤J is close to colorless.
2. Diamond clarity refers to the content of diamond, which is the natural symbol of diamond itself. The less impurities in a diamond, the less conspicuous its position and the higher its quality, and vice versa. Cleanliness grades are FL, IF, VVS 1, VVS2, VVS 1, VS2, Si 1, Si2, Si3, P/I 1, P/I2 and P/I3.
3. The weight grade of the diamond is divided by the unit carat. One carat is equal to 0.2 gram, which is equal to 100 integral. Generally speaking, 1 carat is a dividing line, and diamonds below 1 carat are much lower than 1 carat. Other things being equal, the greater the weight of a diamond, the higher its value.
4. The cutting of diamonds is mainly the symmetry and balance of diamonds, and it is also the only man-made factor that affects the value of diamonds. The reason why diamonds have a shiny side is mainly because of the cutting of diamonds, that is, the problem of diamond cutting. How to classify diamonds is also very important in cutting. High cutting grade, beautiful diamonds. The cutting grades are Ex, Vg, g and p.