The inorganic components of pearls are mainly calcium carbonate and magnesium carbonate,Pearls accounting for more than 91%, followed by silicon oxide, calcium phosphate,Pearls Al2O3 and Fe2O3. Organic matter in pearls contains aspartic acid, Pearls threonine, serine, glutamic acid, glycine, alanine, cystine, valine, methionine, isoleucine, leucine,Pearls tyrosine, benzene 17 kinds of amino acids such as alanine, histidine, arginine and proline. In addition,Pearls it also contains more than 30 trace elements, taurine, rich vitamins and peptides.
Pearls come in many shapes, including round, pear-shaped, egg-shaped, teardrop-shaped,Pearls button-shaped, and random, with round being the best. Heterogeneous body. The colors are white, pink, Pearls light yellow, light green, light blue, brown, lilac, black, etc., mainly white. White streaks. It has typical pearl luster,Pearls soft luster and rainbow color. Transparent to translucent. Refractive index 1.530-1.686,Pearls birefringence: aggregate is not measurable. No dispersion. Hardness 2.5-4.5. The density of natural freshwater pearls is generally 2.66-2.78g/cm3,Pearls which varies depending on the place of origin. No cleavage.Pearls Good toughness. Under short-wave ultraviolet light, white pearls are light blue to light yellow;Pearls yellow and gold pearls are yellow-green, greenish brown to dark brown; black pearls are usually pink to orange-red;Pearls there is light yellow and white fluorescence under X-rays. Foaming in case of hydrochloric acid.