According to GIA's color grading table, diamonds are classified into 23 grades, from completely colorless D to yellowish brown Z. Among them, D.E.F belongs to the colorless range, G.H.I.J belongs to the near colorless range, K.L.M is light yellow, and below N is light yellow. The name below Z is colored diamond, which is very expensive.
Colorless is the best, and the darker the tone, the worse the quality. In the classification of colorless diamonds, the top color is D color, which is arranged down to Z in turn. Here, only the color scales from D to J are mentioned. D-F is a colorless color scale, and G-J is close to a colorless color scale. Starting from K, there is basically no collection significance, and the ring holders below K color are also very beautiful.
Because diamonds will gradually turn yellow from K, when choosing diamonds, choose the color above H. I-J grade also belongs to the category of near colorless, but a trace of yellowish diamonds with yellow, green, blue, brown, pink, orange, red, black and purple are precious and expensive among diamonds. Red diamonds are the most expensive.
Extended data:
Different countries and regions adopt different color grading systems. American Gemological Institute is divided into 23 grades, which are represented by English letters D-Z respectively. The most commonly used one is 1 1 level d-n. The color grading system in Europe is represented by CIBJO.
The newly formulated Chinese national standard 1996 integrates GIA and CIBJO, divides colors into 12 grades, and uses D-N and.
From the D level down, the price also becomes lower. The price difference of each color scale is generally 10%-45%, and the price difference between high color scales is higher than that between low color scales.
Material identification
Identification method of ring-supporting materials of diamond ring 1: sensory inspection of wedding ring quality.
Look at the color: pure gold is dark yellow, k gold has yellow, red, white and other colors, while imitation gold products are mostly copper alloys with lighter colors. Weight: The specific gravity of gold is 19.3g/cm3, which is much higher than that of imitation gold products. For example, a gold ring is about 5g, while imitation gold products of the same size generally weigh less than 3g.
Identification method 2 of the ring support material of diamond ring: check the mark.
According to the national standard, precious metal ornaments should be marked with the origin, manufacturer, material and content, and products without marks are unqualified products. If there is a quality problem, the quality inspection agency can give detection and judgment according to the imprint. Consumers should buy their own brands and gold ornaments with different gold contents according to the imprint.
References:
Diamond ring _ Baidu encyclopedia
Diamond _ Baidu encyclopedia