The diamond's 4C standard was first created by the GIA American Gemological Institute and has since become the industry's recognized diamond grading standard. The following is a detailed description of the 4C standard for diamonds.
The so-called "4c standard of diamonds" is the abbreviation of four English words beginning with C, which refers to the carat weight (CARATWEIGHT), clarity (CLARITY), color (COLOUR), and cut (CUT).
Diamond's 4c standard weight (Carat weight)
People use carat (ct) to express the weight of a diamond: 1 carat = 100 points. In the case of the other three C, the price of the diamond is proportional to the square of the weight. The greater the weight, the higher the value.
Diamond 4c standard cut (Cut)
Cutting involves the cutting ratio and cutting ratio of a diamond, which is divided into cutting ratio, polishing and modification degree (if these three items are very good, it is called 3EX). Each item has five levels. A good cut will help the diamond shine. That is, we call the diamond fire. When a diamond is not cut flat or too thick, the light will not be The ideal reflection, the light of the diamond will be inferior. The evaluation levels are as follows:
Excellent (excellent) → EX
VeryGood(very good)→VG
Good→GFair (general)
Poor (not good)
Diamond's 4c standard clarity (Clarity)
Clarity classification is based on the location, size and quantity of inclusions. Diamonds with little or no defects are very rare and their prices are therefore extremely expensive. The identification expert observes the diamond under a 10x magnifying glass and divides the clarity grade into:
Innocent level (FL);
Internal level (IF);
Very slight level (VVS1, VVS2);
Slightly graded (VS1, VS2);
Micro-level (SI1, SI2);
There are ç‘•ç–µ (I1, I2, I3)
Diamond 4c standard color (Color)
The color of a diamond is an important determinant of its value. Colorless is the best, the darker the color, the worse the quality.
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