1, carat weight (carat)

The weight of diamonds is measured in carats (also called cards). 1 carat = 200mg = 0.2g A carat is divided into one hundred parts, and each part is called one point. 0.75 carat is also called 75 cents, and 0.02 carat is 2 cents. Under other similar conditions, with the increase of diamond weight, its value increases geometrically; Diamonds with the same weight will have different values due to different colors, cleanliness and cutting. You can find high quality diamonds in every different size and shape. The most important thing is to find a diamond with the right size and style that you like. You might as well try it on in a jewelry store when it looks and feels.

2 clarity

Diamonds are crystallized from mantle magma deep in the earth, with complex environment, diverse components and extremely high temperature and pressure. After hundreds of millions of years of geological changes, it is inevitable that there are all kinds of sundries or defects in it. The color, quantity, size and location distribution of these inclusions have different degrees of influence on the clarity of diamonds. The clarity of a diamond is usually classified by using a magnifying glass with a magnification of 10 to classify the internal and surface defects of the diamond and their influence on the luster. According to China's national inspection standards, it is divided into LC, VVS 1, VVS2, VS 1, VS2, SI 1, SI2, P 1 and P2. Diamonds are divided into five grades: excellent, very good, good and relatively good. P-class drill is also called I-class drill. Diamonds below grade P are generally not used as gems, so they are generally only classified as grade P, and are no longer classified as P 1\P2\P3.

3. Color (color)

Diamonds have many natural colors, from precious colorless (white after cutting), rare light blue and pink to common light yellow. The more transparent and colorless, the more white can penetrate, and the richer the color after refraction and dispersion. The grading of diamond color is determined by technicians repeatedly comparing the diamond to be graded with the standard color colorimetric stone in the grading environment of professional laboratories. The whitest diamond is set to D (that is, starting from the first letter of the diamond). The color of diamonds is divided into 1 1 grades, which are D, E, F, G, H, I, J, K, L, M and N in turn.

4. Cut (cut)

Diamond cutting refers to the accuracy of its cutting and grinding ratio and the perfection after finishing. Good cutting should reflect the brightness and fire color of the diamond as much as possible, and try to keep the weight of the original stone. The cutting grades of IGI International Gemological Institute are divided into ID (standard), EX (excellent) and VG (very good) G (good) from high to low, and the domestic national inspection is divided into EX (excellent), VG (very good) and G (good). In China, ordinary people generally measure the value of diamonds by weight. Actually, it is not scientific. Because small diamonds are very popular in China. Therefore, the more popular concept is high-quality diamonds. High-quality and bright diamonds generally grasp the three principles of 4C: clarity, color and cut, and the three standards must reach a certain standard at the same time.

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