The best lapis lazuli is mainly composed of lapis lazuli minerals, containing a very small amount of pyrite and white calcite, which is harmless to human body. Only the dyed fake lapis lazuli is harmful to human body. The material used for dyeing is garbage material containing a lot of white calcite, and pyrite is also distributed in flake form. Staining lapis lazuli is a time bomb endangering health. Long-term contact between chemicals and skin is likely to cause skin allergies and even cancer.

The taboo of lapis lazuli:

1, corrosion.

Lapis lazuli is forbidden to corrode. Avoid contact with detergents, cosmetics, perfumes and other substances. These substances are chemically synthesized, which will seriously affect the texture of lapis lazuli and make the surface of lapis lazuli lose its luster.

2. Stains.

Lapis lazuli avoids stains. There are countless tiny pores on the surface of lapis lazuli, which are used to absorb foreign substances. These stains contain many harmful substances. If lapis lazuli comes into contact with stains, its luster will become dim.

Identification method:

Natural lapis lazuli has a granular structure under a magnifying glass, and often contains pyrite spots and white calcite lumps.

Lapis lazuli is generally blue, and its color is determined by the content of lapis lazuli minerals. Good lapis lazuli is dark blue, pure, crack-free, fine in texture, containing calcite impurities, and can be made into jewelry. If white stone lines or white dots are intertwined, the concentration, purity and uniformity of colors will be reduced, and the quality of jewelry will be reduced.

The texture of lapis lazuli should be dense and fine without cracks, and pyrite should be evenly distributed, like shining stars. The local distribution of pyrite will affect the texture of lapis lazuli jade, and the more obvious the crack, the lower the quality grade.