Method of distinguishing between true and false lapis lazuli

Lapis lazuli is a kind of blue gem. Many people like the calmness and generosity of lapis lazuli. The good lapis lazuli is of great value, but it is precisely because of the popularity of lapis lazuli that more and more counterfeit lapis lazuli is on the market. If we can identify the true and false lapis lazuli is the place we urgently want to learn, then Xiaobian will tell you how to identify the true and false lapis lazuli .

For the level of lapis lazuli: the color of lapis lazuli is divided into four grades, lapis lazuli, green gold, gold grid, and stone. The highest level is "Qingjinshi class", Baolan Shaojin, the texture is extremely delicate and smooth, and it is easy to see more of the physical comparison. The lowest level of "promoting stone grade" is easy to be recognized because of a large number of white spots. In general, pure blue without or with micro-gold pyrite has the highest quality of lapis lazuli with fine texture without white streaks.

1) Look at (calcite) white/yellow spots. The presence of white/yellow spots is basically considered to be natural products. Note that it is not pale blue markings, and the boundary between white spots and blue is obvious.

2) Look at the dark green diopside, some lapis lazuli will have dark green diopside impurities, and the dyeing products are basically not, which is also the identification point.

3) Look at the dye deposition. Generally, the dyed product is very dark in the crack and may be dyed. But not absolutely, because there are also black lines/black lines in natural lapis lazuli.

4) Wipe the reagent, take a bead to be identified, use hot water for 10 minutes (remove the surface may interfere with the identified wax), wipe with acetone / nail water / alcohol, if it turns blue, it can be basically identified as dyeing .

[Note]: The statement that the rope is dyed blue is not reliable. The lapis lazuli is dye itself. The blue color of the rope may be the color of the processed powder present in the tunnel. It may also be the color of the dye. Nowadays, organic dyes generally do not fade easily when they are in contact with water. Poor dyeing techniques can cause dyed lapis lazuli to fade when it encounters washing powder. Good dyeing technology can achieve general washing without fading.

There are also some methods to identify true and false lapis lazuli according to the appearance, to understand and know more, to distinguish true and false!

Color is color, lapis lazuli is generally blue, its color is determined by the content of lapis lazuli minerals. Good lapis lazuli color is dark blue and pure, no cracks, fine texture, no calcite impurities, can be made into jewelry, etc. . If white stone lines or white spots are intertwined, the concentration, purity and uniformity of the color will be lowered, and the quality of the jewelry will decrease.

Quality is the texture, the texture of lapis lazuli should be dense, delicate, no cracks, and the distribution of pyrite is even like the sparkling starlight. The local distribution of pyrite will affect the texture of the lapis lazuli jade, and the more obvious the crack, the lower the quality grade.

The volume is the volume, which refers to the volume of the lapis lazuli. Under the same quality conditions, the larger the volume of the lapis lazuli, the higher its value.

For the identification of lapis lazuli: whether lapis lazuli is dyed or not, it is really difficult to judge the picture. The most accurate method at present is probably the detection of infrared spectrometer in the laboratory. Because the dye must exhibit a special absorption peak, it is impossible to be the same as the natural one. The color of lapis lazuli is generally divided into dark blue, purple blue, sky blue, green blue and the like. The lapis lazuli is uniform in color and has no cracks. The fine texture is beautiful and the beautiful Venus is better. If the content of pyrite is low, there is no Venus on the surface and the quality is not affected. However, if Venus is black, dark, or has a large amount of calcite, a large area of ​​white spots is formed on the surface, and the value is greatly reduced.

The above is the identification method of lapis lazuli, I hope to help everyone!

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