Pearl
Pearls can be defined as the secretion of a spherical material formed inside oysters or some molluscs. It can be classified as a kind of gemstone. This material is excreted from the epithelial cells in the oyster wall, which is a tissue between the body and the shell.
Pearls are constructed from layers of magenta or calcite, calcium carbonate, and these layers hold together through the concoolin, a solid organic matter.
The difference between natural, industrial and agricultural pearls
Pearl is used in the manufacture of jewelry into two categories: real pearls: which is extracted from the depths of the sea after it consists in the oysters, including natural and agricultural pearls, and the second category is artificial pearls: a pearl that is manufactured and produced in factories, and can be distinguished through the following:
- Natural pearls: pearls that do not interfere with human composition. When a foreign body enters the seashells naturally, you release a substance called the pearl material that encapsulates this body because of fear of it, and in order to protect itself, and with the passage of time up to about 8 years consist Pearl granules, this means that it is extracted from the deep sea ready and is the most expensive pearl species.
- The pearl is the pearl that does not enter the human in its composition, but the man brings the oysters and put inside a strange object to make the oyster secretion of pearl material and keep them in farms and lakes private until the pearls are formed and then extracted.
- Artificial pearls: a pearl that man makes by mixing some chemicals to acquire certain qualities and properties of real pearls.
Pearl shapes and composition
Pearls are either in the form of rice, pear, or ball, which are shaped like buttons. Their value is evaluated according to this order. There are pearls that are attached to the inner surface of the oyster. The best pearls are colored white or light pink or ivory, while black pearls are the most expensive forms of pearls for their scarcity, and there are yellow, blue, green and brown.
The brilliance of pearls is reflected by the successive interference in the layers of its formation, which works to break the light falling on its surface. The pearl is also very soft and is affected by heat and acids. It is composed of organic materials.