The lapis lazuli is divided into four grades. The order from excellent to bad is: lapis lazuli, Qingjin, Jinkelang, and gradual stone. These different grades of lapis lazuli have relatively large differences in quality. Let us introduce in detail the differences between these four levels of lapis lazuli.
Lapis lazuli grade: This grade of lapis lazuli requires uniform color, purity and thickness. The texture is fine, tough, dense, pure and less impurity. The content of lapis lazuli minerals is over 99%, more concentrated and there is no yellow iron too ore. The impurity content is not high, the hardness is generally high, the texture is fine and tough, the color is pure and bright, and there is no motley. And there are fewer cracks in the gemstone, which is the best quality lapis lazuli.
Qingjin class: This level of lapis lazuli is slightly below the lapis lazuli level of lapis lazuli. It requires uniform color, purity, depth, fine texture and compactness. It is relatively pure and has no white spots. The amount of lapis lazuli minerals is in percent. 90 to 95 percent, and contains a small amount of impurities and star point off pyrite, but the color purity, richness, uniformity is less than the lapis lazuli grade, and there are star-shaped variegated colors in the color .
Jinkelang grade: This grade of lapis lazuli, with uneven distribution of light blue, and white flowers and white spots, the color is not pure, deep, and contains more impurities such as pyrite, the content of lapis lazuli minerals relative to green gold The grade of lapis lazuli is significantly reduced, the content of lapis lazuli is lower, the impurities are obviously increased and the pyrite is more densely distributed, which makes the hardness of the gemstone lower, the texture is not fine and tough, the color becomes lighter, the mottle color increases, and the color distribution is not Evenly.
Promote stone grade: This is the lowest level of lapis lazuli. This level of lapis lazuli is the worst, and the color is white-blue mixed plaque or unevenly distributed star-shaped blue. Such lapis lazuli usually does not contain impurities such as pyrite, but contains a large amount of impurities such as calcite. The content of lapis lazuli minerals is the least, but other impurities are particularly large, the texture is loose, and the hardness is relatively low. Only jade can be seen. Star-shaped blue or blue and white, the impurities are obviously increased, and the utilization value is not large.
Although the above four levels are all lapis lazuli, but there are also differences in quality. We have introduced the four levels of lapis lazuli in detail through their four levels of mineral composition, color, texture, etc. Help everyone buy.
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