Turquoise is an ancient jade. The history of wearing crystal can be traced back to the Persian kingdom in the 3rd century AD. Buddhism, which was prevalent in Asia, also regarded it as an important tool. Today, the turquoise ornaments we see are mostly inlaid with silver. The style still retains the exotic atmosphere of the Middle East and the mysterious color of Tibetan Buddhism.
The most famous turquoise producing area in the world is Iran. China's turquoise is mainly produced at the junction of Hubei, Henan and Shaanxi, and is most famous for the Fuyang Green Pine Mine.
Turquoise shades are dominated by blue-green. High-grade turquoise, that is, turquoise for jewelry, requires a standard sky blue and uniform color. Followed by dark blue, blue green and light gray blue.
High-grade turquoise requires higher density and hardness, because these properties can directly reflect the degree of weathering of green pine. As the weathering deepens, the hardness and density will decrease accordingly, and the color quality will be adversely affected.
Turquoise contains clay minerals and calcite and other impurities. These impurities are mostly white. The jade is called white brain in the jade. The turquoise of white brain development is easy to burst when processed, and the quality is obviously reduced.
Turquoise is the only jade that can be ground together with surrounding rock. When the pattern of surrounding rock and turquoise has a certain symbolic meaning, the product will be well received.
Turquoise counterfeit identification method:
1. gibbsite: a mineral that is symbiotic with turquoise, the main difference from turquoise is
(1) Its color is relatively light and it is difficult to reach sky blue:
(2) Glass luster, which is different from turquoise waxy and earthy luster.
(3) Brittleness, easy to collapse, and turquoise is more resilient.
(4) The hardness is low.
(5) Soily smell.
(6) The density is lower than turquoise.
2. Chrysocolla: It is a mineral similar in appearance to turquoise. The main difference is
(1) The color is bright and the transparency is high.
(2) The refractive index is low.
(3) The density and hardness are relatively low.
3. Blue-green glass: The main difference is that it has a glass luster, a shell-like fracture, and bubbles and swirls that may be seen inside.
4. Reconstruction of turquoise: It is made by pressing some turquoise particles and blue powder materials under a certain temperature and pressure. This material can be identified by the following aspects
(1) Structure: The appearance is like porcelain, and there is a distinct granular structure.
(2) Acid test: It is blue due to the copper-containing compound, and the copper salt can be dissolved in hydrochloric acid. The acid is dropped on the surface and wiped with a white cotton ball, which will fade.
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