Pearl is an ancient organic gemstone produced in pearl shellfish and mother-of-pearl mollusks. The calcium carbonate-containing mineral (aragonite) beads produced by endocrine function are composed of a large number of tiny aragonite crystals. Into. The chemical composition of the pearls is: CaCO 3 91.6%, H 2 O and organic matter 4% each, and other 0.4%. The shape of the pearl is various, and it has a round shape, a pear shape, an egg shape, a teardrop shape, a button shape, and an arbitrary shape, and a circular shape is preferable. Heterogeneous. The colors are white, pink, light yellow, light green, light blue, brown, lavender, black, etc., mainly white. White streaks. It has a typical pearl luster with a soft luster and a rainbow glow. Transparent to translucent. The refractive index is 1.530-1.686 and the birefringence is 0.156. No dispersion phenomenon. Hardness 2.5-4.5. The density of natural freshwater pearls is generally 2.66-2.78g/cm3, which varies depending on the place of production. No clerk. Good toughness. Under short-wave ultraviolet light, the pearls are white, light yellow, light green, and blue, and the black pearls are reddish-fluorescent; under X-rays, there are yellowish white fluorescence. Foaming with hydrochloric acid.
With its warmth, elegance, and magnificence, the pearl has always been loved by people and is known as the Queen of Jewelry. The composition of pearls is calcium carbonate containing mechanism. It has poor chemical stability, is soluble in acid and alkali, and is not suitable for contact with perfume, oil, salt, alcohol, hair cream, vinegar and dirt in daily life. Organic solvents; in summer, people sweat more, and should not wear pearl necklaces. When not in use, wash them with high-grade neutral soap or detergent, then dry them. Do not expose them to the sun or bake them in the sun; together, do not be long on the vaults of banks. The hardness of the pearl is low. Long-wearing white pearls will be yellowed, making the gloss worse. It can be bleached with 1%-1.5% hydrogen peroxide. Be careful not to drift over the head, otherwise it will lose its luster.
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