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How to judge the value and quality of a carat diamond
The quality of diamonds can generally be judged by "4C".
"4C" is a measure to judge the value and quality of a diamond. The so-called "4C" is the abbreviation of four English words beginning with C, which refers to the weight, clarity, color and cut of a diamond.
1. weight
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.
Step 2 be clear
The color, quantity, size and location distribution of inclusions have different effects on the clarity of diamonds.
Step 3: 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). Diamond color * * * is divided into 1 1 grades, which are D, E, F, G, H, I, J, K, L, M and N respectively.
Cut 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.