About Torques Stone

Today, Neyshabur (IRAN) turquoise mine is known as the largest turquoise mine in West Asia in Razavi Khorasan province of Iran, and some tourists interested in ornamental and decorative stones go to visit this place. According to researchers, there are more than 8 thousand tons of turquoise in this mine. which can be harvested 40 tons per year to prevent indiscriminate harvesting.
Interesting information about the original turquoise stone

Turquoise is a valuable and precious stone that exists in turquoise colors with different color tones of light blue, dark blue, light green and dark green. Turquoise stone is a type of igneous rock that is found in volcanic areas and near the surface of the earth. Turquoise is a stone with a hardness of 5.5 to 6. This stone becomes stronger if it is completely dry.

Turquoise stones found deep in the earth are softened due to the acid production of underground water, so they have less quality and gem value. The best type of turquoise is found near the surface of the earth.

Types of turquoise
This stone, which is known as Firuzeh in Iran, is called Turquoise in English, and the reason for this name can be that:

In the past, when turquoise mines were not yet discovered in Europe and America, all European trade relations with Iran in the field of precious stones were done through Turkey, and Turkish merchants bought precious stones from Iranians and sold them to Europeans. The reason for turquoise, which was an unfamiliar stone for them and imported from Turkey, was called Turkish stone.
Others believe that the origin of this name is derived from the French name of this stone, which was used to describe the stone. In France, this name Pierre Turquin means blue colored stone, which has gradually changed to turquoise in the English accent.
Turquoise stone can be classified based on three characteristics.

These three features are:
By color:

Turquoise has a wide range of colors. This stone is available in dark blue, pale blue to deep green colors. The more dark blue dominates the green in the turquoise, the higher the value of the turquoise.
According to mine:

Turquoise is mined in all parts of the world, but Iranian turquoise, Tibetan turquoise, American turquoise, and Egyptian turquoise are the most important turquoise mines around the world. The most important turquoise mines in Iran are located in Neyshabour, Damghan and Kerman, but Neyshabour turquoise is the most valuable turquoise in the world from a commercial point of view.

Kerman and Damghan turquoise are of lower quality and value compared to Neishabur turquoise and Tibetan or American turquoise.
Based on appearance:

In the third, which is customary in Arab countries, turquoise is divided into two types: ajami and shajri. Some turquoises have streaks, but others are completely smooth and uniform blue with no streaks or fractures on their surface. The Arabs call this type of turquoise Ajami turquoise.