The natural pearl is mainly the growth in the temperate zone, in the water depth 8-15 meter about sea water. Is in the sea water bacterium, the air bubble or the gravel and so on small material enters mother-of-pearl shell in vivo, touches after the mantle, the mother-of-pearl shell has received the stimulation, then secretes the pearl nature to wrap the foreign matter, grows into near circular the sphere pearl. The natural pearl internationally, divides into the Eastern bead and the southern coastal provinces bead two kinds according to the habitat.
1. Eastern bead The Eastern bead also often uses for to take the natural pearl the pronoun, the main habitat has two The Persian Gulf production area located at Iran west, east of Saudi Arabia's Persian Gulf sea area, picks fishes the natural pearl mainly to concentrate in Persian Gulf's west, the Saudi Arabian domestic epicontinental sea area. This area produces the pearl is excellent in quality, in the white, the cream color results in the body color, is accompanied by the green iridescence. Strong pearly luster. Paris pearl trading market in once every year, 90% above, superior natural pearl from this area Sri Lankan production area Sri Lanka produces pearl from the Manaer bay. The pearl assumes the white or the milk white, carries in the body color to be accompanied by green, blue or the purple iridescence.
2. southern coastal provinces bead The southern coastal provinces area includes Burma, China, the Philippines and Australia, produces the natural pearl in these areas to call the southern coastal provinces bead, the southern coastal provinces shots, the shape circle, the color is white, has the strong pearly luster, said that " the silver light " the gloss, is also the world precious pearl variety The natural pearl assumes the circular, the lateral section by in and the table, is a extremely thin concentric circular nacreous layer superimposition becomes. Recognition by eye's main basis has the following three spots The color natural pearl's body color is mainly the white, the milk white, the pink, occasionally sees the cinereus.
Above is accompanied by the rose color, the blue color, the green and so on gorgeous iridescence The shape and the structure natural pearl present the sphere, places one it to dig has above the pinhole paper carton, admits in the paper carton the glare flashlight to shine through, what saw is a structure even subtranslucent spheroid, has not looked like breeds artificially has nuclear pearl such, has stripe shape in The superficial papula pearl is one living thing product, has some papular infection in the pearl surface, the big papula may see with the naked eye is the bulge small blister, the small papula with tooth rubbing below gently, or two grain of beads treats is rubbing, has the obvious sand feeling.