What is the diamond grade? The diamond grade is mainly included in the diamond 4c standard, that is, carat weight, clarity, color and cut. Each standard contains its own level. If the other three diamonds are of the same grade, the price of a standard decreases from high to low.

There are about 8800 kinds of diamonds, among which color D, weight, FL clarity and ideal cut are the best, while color Z, light, I clarity and differential cut are the worst. According to reports, Colia diamonds only provide high clarity grades from FL to SI, high color grades from D to J, and ideal to general cutting grades. Diamonds in this grade range have high collection value and are often the first choice for diamond buyers. Diamond grades also include table width ratio, pavilion depth ratio and fluorescence grade. This is a complicated knowledge. Let's introduce the diamond grade from GIA's most basic diamond 4c.

GIA refers to Gemlogical Institute of America (Gemlogical? Institute? Yes? The United States) is a pioneer in classifying diamond grades into international standards in detail. It is often said that GIA can be used as a reference for diamond grade 4C.

I. Diamond Grade-Color (Color)

Grade d: completely colorless. The highest color level is extremely rare.

Class e: colorless. Only professional instruments can detect trace colors. This is a very rare diamond.

Class f: colorless. Jewelry experts can detect a small amount of color. It belongs to high quality diamonds.

G-H grade: almost colorless. Compared with DEF diamond, it has a slight color. Still has high value.

I-J grade: almost colorless. Slight colors can be found with a magnifying glass. High value.

K-M grade: dark color, similar to this grade, Kerria diamonds are not available, and customers are advised not to use them.

N-Z grade: poor fire color, similar to this grade, Kerria diamonds are not available, and customers are advised not to use them.

Second, the diamond grade-weight (carat)

Carat (CT) A unit of measurement for the weight of a diamond. 1 carat = 0.2g = 100 min. 0.75 carat is also called 75 cents. When other 3c (color, clarity and cut) standards are similar, the greater the weight of a diamond, the higher its value will be. Carat diamonds have the property of preserving and increasing value, and the bigger they are, the more brilliant they are.

Three, diamond grade-Clarity (clarity)

Every diamond contains natural inclusions, which is the result of the variation of surrounding environment and the invasion of other crystals during the development and crystallization of diamonds. The size, color, shape and quantity of these inclusions determine the clarity of diamonds. The smaller the inclusions, the higher the light penetration rate inside the diamond, and the more charming the shining light of the diamond will be.

Most of the contents can't be recognized by the naked eye, and they can only be seen clearly under the magnifying glass of 10 times. Using 10 times magnifying glass to observe the number, distribution and size of internal and surface defects of diamonds and their effects on diamond luster, which can be divided into LC, VVS, VS, SI, P, * * * and 10.

Cleanliness is a grading standard to measure inclusions and defects: from FL/IF (internal flawless/flawless) to I (defective). Class I clarity means that the contents can be identified with the naked eye, even nicks and cracks. Claria diamonds do not provide Grade I clarity diamonds, and each diamond has a GIA certificate. It is easy to see whether the definition is up to standard.

Iv. Diamond Grade-Cutting (Cutting)

Cutting refers to the angle at which the technician cuts the petal surface of the diamond and the proportion of each part of the diamond after cutting. In the 4c standard of diamond value measurement, only cutting is directly affected by human activities. Although diamonds can be processed into various shapes to meet different tastes, the fineness of cutting directly affects the fire color of diamonds. According to the scientific equation, the perfect cut diamond should reflect the light entering the diamond through different petal surfaces, and finally condense on the top of the diamond, blooming like a rainbow. Cutting the diamond disproportionately will make the diamond lose its luster and fail to achieve the radiant effect. So the value of cut diamonds is of course high.

Excellent: It represents the standard that only 3% of first-class quality diamonds can reach. This kind of cutting makes the diamond refract almost all the light entering the diamond to the surface of the diamond through the optical principle, which is colorful and very beautiful.

Very good: it represents about 15% of diamond cutting. It can make diamonds reflect a standard level of light. But it will be a little lower than the ideal cutting value.

Good cutting: about 25% of diamond cutting. Diamonds reflect most of the light that enters them. Cheaper.

General: indicates that the roughness of diamond cutting is 35%. The quality of diamonds is very good, but the light reflected by diamonds after fair cutting is not as good as that of G-cut, which wastes a high-quality diamond.

Poor: This includes all diamonds that do not meet the general cutting standards. The cutting of these diamonds lacks heat and technology. Cutting too light, too hard, too deep and too shallow will make the light flow out from the edge or bottom, thus making the diamond lose its due luster.

Personally, the grade of diamond ring also includes the setting of a diamond ring. The perfect cut of Colia Diamond has laid the exquisite inlay technology of Colia diamond ring from scoring, splitting, sawing to polishing. On the premise of ensuring that the beauty of diamonds is clearly presented to the greatest extent, each piece of jewelry looks more dazzling by using the optical principle and skillfully using the incidence and reflection of light at different angles. As a wholesaler of loose diamonds in South Africa, it will retail online at wholesale price this year, and you can buy more advanced and better diamonds at the same price.

However, the price of diamonds does not directly reflect the grade of diamonds. Overpriced diamonds may just pay for the brand effect.