As the name suggests, it is a green garnet. Among the garnet families, only the green garnet (Demantoid), savory stone and garnet are high-grade gems, among which the garnet (Demantoid) is the most rare.
The high dispersion of garnet and the "horse tail" inclusions are important markers. From the emerald-like green-greenish-yellow-greenish-brown green, there is a golden glow between the vagueness, which is fascinating because it is better than the characteristics of diamond dispersion, that is, when the light enters When the gems are formed, the essence of the fire effect is stronger. Because of this, people named Demantoid in Dutch, which means the diamond-like diamond-like brilliance. Full of green, the Chinese translation is called 〠绿 榴 〞 or 〠榴 〞.
Demantoid is a yellow-green or emerald green garnet containing chromium. It was mainly produced in Russia's Ural Mountains. The yield is very small. The characteristic ponytail asbestos inclusions are typical special inclusions. Object. Today, the origin of the garnet (Demantoid) is mainly in Africa. The minerals in Russia are almost exhausted, and the clarity is usually translucent. Although the collectors are very fond of it, the business is basically difficult to push into the market. The garnet (Demantoid) produced in Madagascar and Central and West Africa can produce high quality and good clarity karat grade gems.
First, the high dispersion of garnet
The most proud of the garnet is its dispersion, which is 0.057, which exceeds the diamond by 0.044. In addition, its excellent refractive index and gloss, the flicker is unusual and amazing. A high-quality garnet, even in ordinary daily light, multicolored refraction will fly from the inside of the gem, which can be clearly observed with the naked eye, making the gem full of beauty and dreamy feeling. This is why the quality of garnet and emerald price is quite the same. If you like to collect precious and special gems, then garnet is a good choice.
In addition to being cut into an emerald type, garnet is often cut into a round diamond shape to highlight its high dispersion. Most of the garnets are less than 1 carat, and 2 carats of high quality garnet is very rare, while the 5 carat quality garnet is a world class gem.
Second, the "horse tail" inclusions
Viewed under the microscope, there are some asbestos fibers in the garnet. The crystalline inclusions in the middle emit curved yellow-brown to yellow fibers. These bundles of silk and divergent linear inclusions look alike. Fireworks. These fibrous inclusions often appear individually or in groups without a distinct shape or divergent center. This is a sign of distinguishing between true and false garnets.
In addition, special horsetail inclusions can increase their value. This comet-like radioactive fibrous inclusion is also the focus of collectors. When cutting, it will be carefully adjusted to become directly below the table. classic work.
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