Jade classification and quality identification
Jade grading
1 special grade: bright green (emerald green), apple green, glass ground (translucent, fine texture), even and bright, no impurities, no cracks.
2 Commodity grade: green, oil green, micro-transparent, intertwined and translucent grandmother green veins and spotted green.
3 general grade: è—• powder ground, bean green, light green, white delicate, slightly transparent. Opaque jade, generally only used as jade jewelry.
Quality identification of jade
1 texture. The natural jade texture is transparent or translucent, and the surface is oily and lustrous. Careful observation reveals a slightly rounded, slightly transparent "salt grain" and fibrous material surrounding it.
2 hardness. Natural jadeite is jadeite, the Mohs hardness is 7 degrees, and it is scored with sharp tools, leaving no traces; the fake jade has low hardness, and the sharp knife can draw traces.
3 green. The natural jade looks at the strong light, and it can be seen that there are other green mineral glitters, which are called green flowers or green. The fakes made of glass, plastic and porcelain have no such "green" characteristics.
4 relative density (specific gravity). The natural jade structure is hard and compact, has no bubbles, and has a high density. The sound is crisp when struck; the fake product has a loose structure or bubbles, and the density is small, and the squeaking sound is not crisp.
5 colors. The authentic green color is pure and pure. Some fakes are made of white jade, serpentine, Australian jade, Korean jade, marble and even miscellaneous stones. After decolorization, they are filled with high-hard plastic pulp and added for color treatment, or immersed in green liquid to make "additional jadeite". "Under the strong light, the green lines are visible, messy and small; some are not grainy, but the turbidity is unclear, the gloss is poor, and the weight is lighter than the original." The above-mentioned fake product is placed in the boiled wax liquid, and the poured pigment is gradually precipitated. This test will not damage the sample being tested, but also identify the true and false. Observed by the Selsey filter, the color Cui is purple in the mirror, and the natural color does not change. Some fake jadeites are artificially smelted with glass, the structure is slack, the green is evenly dark, some have bubbles, and they are hit with a hard device, and the sound is hoarse.
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