Identification of lapis lazuli;
(1) Natural lapis lazuli has a granular structure under a magnifying glass, often containing pyrite spots and white calcite lumps.
(2) 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.
(3) If lapis lazuli is interwoven with white stone lines or white spots, it will reduce the concentration, purity and uniformity of color and the quality of jewelry.
(4) The texture of lapis lazuli should be dense, fine and crack-free, 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.