The lapis lazuli is an ancient gemstone. The blue color is mysterious and solemn. The gorgeous appearance is self-evident. At present, the best lapis lazuli in the world is mainly produced in Afghanistan. The value factors affecting lapis lazuli can be based on cracks, colors and textures. , volume (blockiness) and cut and work. First, the existence of cracks in lapis lazuli will obviously affect the quality of lapis lazuli. No crack is best, followed by microcracks, and the more obvious the crack, the lower the quality grade. Second, the texture of lapis lazuli is also an important factor in evaluating the quality of lapis lazuli. The texture is dense, tough, delicate, with many lapis lazuli minerals, and contains less impurities and other minerals (such as calcite, pyroxene, mica, blue stellite, etc., but may contain a small amount of pyrite with evenly distributed star points), such a green Gold stone is the top grade. If the pyrite is partially distributed in a sheet, it will affect the texture of the lapis lazuli, which in turn will affect the quality of the lapis lazuli. For lapis lazuli containing impurity minerals, the uniformity of the distribution of impurity minerals will also be a criterion for evaluating the texture. It is generally considered that the impurity minerals are evenly distributed, and the quality level is higher than that of the uneven distribution, and vice versa. Third, the color of lapis lazuli is determined by the content of lapis lazuli minerals. If the lapis lazuli mineral content is high, the color is good, otherwise the color is worse. Because the lapis lazuli mineral is blue, lapis lazuli Jade is also generally blue, and it is best to use blue, rich, pure and uniform. If white or white spots are interlaced in the color, the concentration, purity, and uniformity of the color are lowered, so the quality is lowered. 4. The volume of lapis lazuli refers to the size of the lapis lazuli block. Under the same quality factors, the larger the lapis lazuli block (whether it is a jewelry stone or a rough stone), the higher its value. 5. Because lapis lazuli has beautiful and pure blue color, high-quality, crack-free lapis lazuli can often be used as jewelry stone. The lapis lazuli used as jewelry is often cut into flat shape and curved shape. The lapis lazuli cut into flat type is generally the highest quality lapis lazuli jade, and the lapis lazuli jade cut into a curved surface is of lower quality than the lapis lazuli, so according to the shape of the lapis lazuli cut, It is also possible to roughly distinguish the quality of lapis lazuli. Woven Dyed Farbic,Yarn-Dyed Plaid Fabric,British Style Fabric,Soft Feeling Woven Farbic SHAOXING CITY CHENYAO TEXTILE CO,LTD , https://www.chenyaotextile.com.jpg)
October 07, 2020