Indicator of real gems

Precious stones are by nature formed crystals with different mineral compositions. Gemstones can, for example, consist of only one mineral, such as diamonds, composed of pure carbon or citrine quartz, or they may comprise several different substances.

Examples include the aquamarine, which consists of beryllium, alumina and silica, or Turquoise, which is also composed of alumina and phosphate. Precious stones are usually made of so-called single crystals. For a single crystal, however, declared as a gemstone, it needs some important characteristics.

The first criterion is the rarity. Frequently occurring crystals such as field or fluorspar are indeed beautiful to look at, but no jewels. They are just as usual, but not as a noble means. Another important criterion for a gem is perfection.

The purity of a gemstone is measured by its inclusions of foreign atoms and divided. Impurities and defects in the crystal lattice lead to a significant impairment of the stone. Equally important is the color of gemstones

The color comes about as a rule by a contamination with a specific gemstone for each impurity. The hardness plays an important role. Very hard stones are known as gems. Softer stones, however, are more "ignoble".

A slightly obvious criterion for a gem is its size. For example, a diamond of 50 carats is far more valuable than 50 einkarätige diamonds. A final criterion, which is complemented by the educated people of the nature of stone still, is the finishing touch. A perfect cut leaves a rough yet to come true advantage.