Lapis lazuli is a beautiful gemstone with a long history of very bright blue tones. Our common lapis lazuli is a multi-mineral aggregate, which can see other colors such as white and gold on the lapis lazuli. They are not lapis lazuli minerals, but some calcite, pyrite, ordinary pyroxene, horn. Mineral impurities such as amphibole and mica. The color of lapis lazuli is not necessarily all sky blue, but also dark blue, sky blue, purple blue and green blue. So which lapis lazuli is the best quality? The highest quality lapis lazuli is known as the emerald lapis lazuli. This lapis lazuli structure is dense, tough and delicate, with a rich, pure, uniform blue tone and no cracks. More importantly, the surface of the emerald lapis lazuli does not see other mineral impurities, which means that almost no gold and white are visible, just a very pure lapis lazuli. This type of lapis lazuli is relatively rare, so the price is relatively high and has a good collection value. Elastic Scuba Crepe Fabric,Scuba Textiles Fabric,Double Sided Scuba Fabric,100% Polyester Scuba Fabric Shaoxing Winfar Knitting & Embroidery Co.,Ltd. , https://www.wfknitting.com