Pearl and composition
Pearls may be in the form of a grain of rice or pineapple or spherical form or in the form of buttons or irregular in shape and be evaluated by an arrangement known · pearls that are found attached to the internal surface of the shell metaphorically behalf (Pearls pimples)
Best Alali types are usually white in color and sometimes be the touch of ivory or light pink color and may also marred by a touch of yellow, green or blue, brown, black · black pearls are very expensive because of their rarity ·
Sparkle or unique pearls sparkle depends on the reflection and refraction of light from the half-layered transparent, accurate and in proportionality whenever classes were less dense and more numerous ·
Sparkle that appears from some Alali because of successive layers overlap, which breaks the light falling on the surface ·
Pearl Do not cut or refine other gravel · are very soft and are affected by acid, heat, and as organic materials, they are susceptible to degradation ·
Pearls, precious obtained from oyster brine (especially type Pinctata) as well as from oysters fresh water (especially type Hyriopsis) The largest center of natural pearls in the world in the Persian Gulf, which is said to produce the best saltwater pearls and there are other important sources, including the coasts of India and China Japan, Australia and the Pacific Islands different, Venezuela and Central rivers of Europe and North America, and in ancient times it was the Red Sea is an important source of pearling ·
