How to classify blue crystal
The crystal is mainly divided into radioactive and adsorptive crystals, the radioactive crystal is worn in the right hand, and the adsorptive crystal should be worn in the left hand.
How to classify blue crystal
In the industry, the crystal grading only ranks the third type of rose-like blue crystals produced in Sri Lanka. There are generally three first type 5A, one is the seed level, and the other is the fluorination level.
1:5A level
This is a level distinction within the industry.
AA grade: The whole blue crystal is flawless, and there are no visible artifacts on the surface such as cracks, smooth and delicate such as gems, fine perforations, and glass luster after polishing.
Grade A1: Very fine flaws, or fine natural inclusions, no more than 3 mm cracks. Polished with a matte finish.
Class A: There is a slight flaw, which is easily broken by the naked eye.
Class AB: There are large pieces of white, yellow and gray, with obvious cracks.
Class B: there is a large area across mottled, there are a lot of cracks, sand sense, such as soil after polishing.
Grade C: The lowest level, the crack is obvious, the surface also has obvious impurities, and it is as rough as brick after polishing.
2: Blue crystal seed
The blue crystal grade used in this bulk wholesale.
Blue crystal beans: surface matt, sand stone, weak effect.
Ink type: There are coarse sand on the surface and more impurities. The surface is smooth and jade, and there is no impurity.
糯 species: the surface is as clean as a gemstone, no impurities, delicate as a gemstone, rich in color such as glutinous rice juice.
Static water dragon stone species: translucent as a gemstone, extremely rare.
3: According to the illuminance
The term diopter itself does not mean transparency but brightness. The finer the texture, the brighter the polished. This is the national gemstone testing standard. The bigger the number, the better the quality. The blue crystal is used for the jewel level, and the lowest level of the jewel is 1 minute.
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