One 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.
1, clarity
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 the national inspection standard of China, it is subdivided into LC, VVS 1, VVS2, VS 1, VS2, SI 1, SI2, P 1.
Diamonds are divided into five grades: excellent, very good, good and relatively good. P-class drill is also called I-class drill. Generally, diamonds below grade P are not used as gem diamonds, so they are generally only classified as grade P and no longer classified as P 1/P2/P3.
Step 2 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.
3, cutting work
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. GIA's cutting grades are divided into ID (standard), EX (excellent) and VG (very good) G (good) from high to low.
China's national inspection is divided into EX (excellent), VG (very good) and G (good). The best cut is "eight hearts and eight arrows", which adopts the world's top Cupid-style cut, and is the exclusive and original diamond cut of CEMNI for thousands of years. Eight hearts and eight arrows are perfectly symmetrical, and the precise and flawless cutting is amazing.
So 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.
The terminal selling price of a diamond (diamond ring) is usually 3~4 times of the ex-factory price of the finished product, that is to say, the price increase in the circulation field is as high as 200%~300%, and some well-known brands are as high as 400%~500% or even higher.
Extended data
The origin of diamond weight-the history of carat;
First of all, weighing small and precious diamonds requires very fine and consistent weight units. Early jewelers mostly used plant seeds with the same volume and weight as the weighing unit.
Mi Dou and wheat ears were first adopted. Ear of wheat is a kind of grain with even weight. Today's units of measurement, such as pearl grains, gold balance grains, constant weight system and drug measurement, all come from wheat ears.
Second, the beans produced by the rice bean tree, or Robinia pseudoacacia, are still important raw materials for poultry and livestock feed and spices until today. Merchants used this bean as a unit of weight, from which today's metric carat came.
Third, carat weight was unified and standardized in the early 20th century.
Reference source? Baidu encyclopedia-diamond ring