Jade is today's "king of jade", many jade friends like jade, natural jade is basically from Myanmar, because of the natural production, its production is not very high, coupled with the non-renewable nature of jade, resulting in jade Prices have been getting higher and higher in recent years, so it is necessary for everyone to know some certain jade knowledge when purchasing jadeite.
In particular, the difference between A, B, C, and D goods of jadeite must be clearly understood. In fact, strictly speaking, only A goods and B goods can be regarded as jade, and others are imitations!
A goods
It is pure natural jade, only polished by carving. It has not undergone any chemical treatment and has not been subjected to artificial heat such as high heat and high pressure. It is a natural color, undyed or electro-colored, and is called "positive color" or "true color". The texture of the naked eye is fine, the color is soft, the stone pattern is obvious; the slight impact, the sound is crisp and sweet; the handcuff has a heavy feeling, which is obviously different from other stone. It is characterized by a density of between 3.32-3.34g/cm3, a refractive index of 1.66, a glass luster, a magnified structure observed in a magnified view, and no fluorescence under the ultraviolet lamp. The certificate of identification is marked as: "Jade" or "natural jade".
B goods
There will be black spots, commonly known as "dirty" jade, soaked and corroded with strong acid, destroying the molecular structure of jade, removing "dirty" and "mian" to increase transparency, and then using high pressure to inject epoxy resin or substitute filling into strong acid corrosion. In the resulting micro-cracks, it acts to fill, consolidate cracks and increase transparency. A slight impact, the sound is boring, there is no crisp sound of A goods. B goods at first look good color, but carefully observed, the color is dazed and evil, under the light to observe, the color transparency is weakened. Due to the destruction of the original quality of jade by strong acid, B goods will gradually lose their luster in two or three years, cracks appear, and long-term wear is harmful to the human body.
C goods
Fully artificially colored. The color is not correct, evil, and careful observation, the color does not exist naturally in the jade, but is filled in the cracks of the mineral, showing a network distribution, no color roots. Observed with a Charles filter, the green color turned red or colorless. Wipe with a strong fade word, the surface color can be removed or turned brown. Long-term wear is not good for health due to the injection of stains.
B+C goods
After soaking and etching with strong acid, the color is added at the same time as the filling is injected, that is, the B-package treatment and the C-package treatment are simultaneously performed.
D goods
Pretending to be jade with other varieties, it is divided into jade, glass and plastic.
Jade class. That is, other jade is posing as jade. There are mainly Thai jade and Malaysian jade, Nanyang Dushan jade, Qinghai jade, dense jade and Australian green jade and Dongling stone. The difference between these jade and jade: First, the hardness is low, and second, the density is small and the gloss is weak.
Glass, plastic. Most of these alternatives are ugly and the gloss is very weak. The relative density is very light, the hardness is low (the nail can be inscribed), and there is no cold feeling.
From this we can know that only A cargo jade is natural jade, with wearing meaning and collection value, B goods are processed only suitable for wearing no value of collection appreciation, C, D goods can be called fake goods.
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