Which gems are similar to sapphires
Blue spinel The blue spinel is blue, uniform in color, with a gray tone and not bright, without pleochroism. The internal common octahedral small spinel inclusions, the characteristic growth lines, ribbons and silky rutile inclusions of sapphire are not seen. Cordierite Cordierite has an attractive indigo blue and is often mistaken for sapphire, so people sometimes call it aquamarine. The chemical formula of cordierite is Mg2Al4Si5O18, which is colorless and is indigo blue and blue due to the trace amount of iron. The main differences between cordierite and sapphire are: (1) Cordierite indigo-light blue-colorless (light yellow) is trichromatic, while natural sapphire is blue-green dichroic, and is not colorless when viewed from any direction; (2) Cordierite is glass luster, which is less bright than the natural sapphire grease-like strong glass luster; (3) The interior of cordierite is generally relatively clean, except that sometimes dust-like mica is wrapped outside the body, and straight or 60?, 120? angled ribbons and silk-like inclusions are not visible; (4) The density of cordierite is significantly smaller than that of sapphire, and there is no heavy feeling in handcuffs. Blue cone mine The blue cone mine is purple indigo, the chemical formula is BaTiSi3O8, and the gem-quality blue cone is mainly produced in California. The main differences between the naked eye and sapphire are: (1) The blue cone mine is a strong glass luster to a semi-golden luster, with high dispersion and visible fire color inside the honed gemstone; (2) indigo-light blue (colorless) dichroism; (3) The hardness is low, ranging from 6.0 to 6.5; (4) The birefringence is large, and the bottom edge double shadow phenomenon is obvious; (5) The particle size is generally small, and most are less than 1 carat. Curtain stone Gem-grade zoisite, also known as tanzanite, was first discovered in Tanzania. The chemical formula of the zoisite is Ca2Al3Si3O12(OH), and the untreated zoisite is pale purple, yellowish green and blue. After heat treatment, it is purple indigo, but the color is bright and uniform, without growth lines and ribbons. Purple-green-blue chromaticity is obvious and the hardness is low. Blue glass The blue glass is uniform in color, clean inside, and sometimes has circular bubbles and a swirling flow structure. Glass luster. The hand touch has a warm feeling, a lighter weight, and a chromatic phenomenon. Blue tourmaline The blue tourmaline has a greenish blue color and the crystal is a complex triangular prism. The hardness, density and refractive index are lower than that of sapphire, the dichroism is extremely obvious, and the birefringence is large. Blue zircon The blue zircon heat-treated zircon has bright color, strong dispersion and high birefringence. Synthetic sapphire: uniform color, clean, rare inclusions, round bubbles, homogeneous body.
Microfiber Fabric Microfiber Fabric,Polyester Microfiber Fabric,100 Polyester Microfiber,Waterproof Microfiber Fabric Shaoxing Haitang Textile Co., Ltd. , https://www.haitangfabric.com