An ancient organic gemstone
Pearl is an ancient organic gemstone, pearl oyster and pearl production in molluscan shellfish in vivo, the role of the endocrine generated calcium carbonate minerals (aragonite) beads, is a large collection of tiny crystals of aragonite and into.
jewellery manufacturers According to geological and archaeological studies have shown that in two hundred million years ago, the Earth already had pearls. International gem industry will also be lucky pearl stone as June birthday, wedding anniversary, and thirteen stone to commemorate the thirtieth anniversary. With magnificent color and elegance of the pearl, a symbol of health, purity, rich and happy, loved by people since ancient times. 2006 a typhoon named Pearl.
A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living shelled mollusk, usually a
tahitian pearl conch. Just like the shell of a mollusk, a pearl is made up of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes of pearls (baroque pearls) occur. The finest quality natural pearls have been highly valued as gemstones and objects of beauty for many centuries, and because of this, the word pearl has become a metaphor for something very rare, fine, admirable, and valuable.
A variety of pearl shapes, round, pear, egg, teardrop-shaped, button-shaped and arbitrary-shaped, in which round is better. Non-homogeneous body. Colors are white, pink, yellow, light green, light blue, brown, lavender, black, etc., in white. White streaks.
golden south sea pearl With classic pearl luster, soft gloss and color with a rainbow halo. Transparent to translucent. Refractive index 1.530-1.686, birefringence 0.156. No chromatic aberration. Hardness 2.5-4.5. The density of natural freshwater pearls generally 2.66-2.78g/cm3, differ by origin. No cleavage. Toughness than really making pearl jewelry (18) well. Significantly in the short-wave UV light pearl white, yellow, light green, blue fluorescent, black light pearl hair red fluorescence; X-ray fluorescence under white light yellow. Case of hydrochloric acid bubbles.
Natural pearls cylindrical spherical, oval, irregular, spherical or oblong, 1 to 6 mm in diameter. Surface white, yellow white, light pink, light blue, etc., with beautiful color glossy and smooth. Ornaments made of pearls, the central most have perforation. Quality hard, hard breaking, section layered. With the fire of a popping sound. Gas-free, taste slightly salty.
The most valuable pearls occur spontaneously in the wild, but they are extremely rare. These wild pearls are referred to as natural pearls.
freshwater pearl Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of those that are currently sold. Imitation or fake pearls are also widely sold in inexpensive jewelry, but the quality of their iridescence is usually very poor, and generally speaking, artificial pearls are easily distinguished from genuine pearls. Pearls have been harvested and cultivated primarily for use in jewelry, but in the past they were also stitched onto lavish clothing. Pearls have also been crushed and used in cosmetics, medicines, and in paint formulations.
