The natural lapis lazuli color is natural, the uniformity is slightly poor, and the yellow spot formed by pyrite is not covered by color. According to the color saturation of lapis lazuli, the uniformity, that is to say the more the color is cyan, the more natural the navy is, the better the natural color, the more uniform the color, the more natural it is! The low-grade lapis lazuli is dull, dizzy, and not bright. The high-grade lapis lazuli color is full of sapphire color, and the color is deep and unremarkable.
In addition, the lapis lazuli is divided into two materials, new materials and old materials. Most people who generally sell goods like old materials. Because of the lack of color, the color should be dull, and it seems less golden sand and less white. Most of the people who use it like new materials, the color is fuller, the white spots and sands are a little more than the old ones, but the colors are young.
Another feature is that the small particles of lapis lazuli are less, but the color is not as full and bright as the large particles. The color of the large particles is better than the beads of small particles. Because the area is large, it is more eye-catching, but the cockroaches are naturally enlarged. These are all natural features.
Lapis lazuli is divided into B, AB, A, 2A, 3A, 4A, 5A by purity.
B is a lot of white spots and sands, and there are few blues. (20% or less pure)
AB is more white spots, more sands, and the color is not bright enough (more than 25% pure)
A is uneven color, white spots and sands are more obvious (more than 40% pure)
2A is less gold and white (more than 65% pure)
3A is less gold and less white (more than 80% pure)
4A is less gold and less white (more than 90% pure
5A is gold-free and white (more than 95% pure)
According to the color, texture and characteristics, it is divided into: lapis lazuli, Qingjin, Jinkelang, and grading.
The lapis lazuli grade, uniform color, pure and very fine and tough texture, with few impurities, the mineral content of lapis lazuli can reach more than 99%, which is the highest level of lapis lazuli.
Qingjin class, this level of lapis lazuli color should be uniform, pure, texture to be delicate and soft, without the formation of white spots. The lapis lazuli mineral content should be between 90% and 95%, and it may contain a small amount of impurities and starpoint pyrite.
Jinkelang grade, the color is distributed in light blue, with white flowers and white spots, the color distribution is not pure, and also contains a lot of impurities such as pyrite. The content of lapis lazuli minerals is much lower than that of Qingjin-class lapis lazuli.
It is the worst grade of lapis lazuli. This grade of lapis lazuli is a white-blue mixed plaque or a star-shaped uneven distribution. The green gold mineral content is the least and the value is the lowest.
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