What are the different types of precious stones?

Precious Stones, also known as gems, are minerals or rocks that become collectors when they are cut or facet and polished. Many of them are commonly used in jewelry.

These stones may occur naturally or can be simulated laboratory. Natural stones come directly from the ground or mine and are cut or transmitted to the desired shape and size. They are usually the most popular among collectors and consumers and also the most expensive. Laboratory simulated versions are created in the laboratory. These artificial stones can still be considered precious stones, but it is easier to come and usually cheaper than their natural counterparts. And go, which is a form of coal. There are several precious stones that are too soft or brittle to be used in jewelry such as single -hastystal rhodochrosite. Although they cannot be used for jewelry, they are exposed to stub and collected collectors because of their beauty.

Gemologists use technical specifications to distinguish the limitI stones. The first aspect in the identification of the gem is the chemical composition. For example, diamonds are made of carbon and rubies are made of aluminum oxide. Most precious stones are in fact crystals that are classified by a crystal system such as cubic , trigonal or .

These stones are also classified into different groups, species and varieties. For example, Ruby is a red variety of corundum that belongs to the spinel group or hematite . On the other hand, all kinds of mineral species beryl .

The separation of precious stones into these types of groups helps to identify their color, their color and their origin. They also have a refractive index, dispersion, specific weight, hardness, cleavage, fracture and shine. Each of these functions is important in evaluating the value of the stone.