The identification method of jade, what aspects of the authenticity of jade
Jadeite is one of the most precious and valuable jade, known as the "crown crown". Because it is deeply loved by people in some countries and regions in the East, it is called the “treasure of the East†by the international jewelry industry. However, with the development of society, more and more jadeites are being faked, and the means are becoming more and more sophisticated, making it impossible to prevent. So, how should we identify the natural A-car jade? The following China Jewelry Merchants Network Xiaobian will introduce you to several aspects of identifying the authenticity of the jade.
1, luster
Determine the gloss. The natural jade has a good luster and is translucent. When viewed, it is like the same water, bright and transparent, full of aura. After the jade is soaked by strong acid and alkali, the structure is loose, and the surface of the jade is not dissolved before the surface is dissolved, so that it produces diffuse reflection and the gloss becomes weak. After adding organic fillers such as resin or plastic, jade often has a resin luster, a waxy luster or a glass luster mixed with a resin luster and a waxy luster.
2, color
Determine if the color is natural. Jadeite A goods will not be treated by dyeing and other processes, and the color is pure natural. The color of natural jade is distributed along the direction of the texture, and gives the impression that the deep embedding in the jade does not give a feeling of emptyness. The transition between the colored part and the uncolored part is natural, with colored roots.
If you use a Charles filter to observe, the natural Burmese jade will not turn red. Due to the destruction of the jadeite structure, the original optical properties have also changed. Therefore, the color distribution of the B-expanded jade has no layering. Although the green color of the jade treated by this method is still the original color, it is soaked by the acidic solution. The base becomes white, the green distribution is relatively floating, and the orientation of the original color is also destroyed, which looks very unnatural.
Observing the color of the jade in the place where there is light, most of the natural jade color is relatively pure and smooth, usually does not mix too much mottled color, its color distribution is uniform, and the gloss is strong; and the artificially treated fake jade does not have This feature, so put the jade in the place where there is light, if the color is pure and bright, then it can be judged that it is real.
3, structure
After the jadeite is soaked and corroded by strong acid and alkali, some substances are brought in and out, forming a corrosion along the mineral crystals on the surface and inside, resulting in internal connected cracks. Under the transmitted light, cracks in the internal and horizontal interlacing are visible. Under the condition of reflected light, the surface of the dissolution pit or arachnoid network is clearly visible. This method of identifying jadeite is identified as surface observation and internal observation.
The internal structure of jadeite was observed by transmitted light. The jadeite structure treated by bleaching and filling was loose, the edge of the grain was blurred, the particles were broken, and the cleavage was incoherent. Under the light, the structure of the A goods is clear, and the B goods are relatively vague. For the colored jade, the A cargo structure is dense and not loose, and the B cargo C cargo structure is scattered, giving people a feeling of floating.
4, surface features
The jade treated by this method has a large difference in hardness between the filling and the jade itself, and a relatively obvious groove is formed in the original crack, and the filling is obviously lower than the two sides, and many splitting constitutes a criss-crossing groove. The cement or residual air bubbles are visible in the large “ditch.†The surface of the jadeite with good processing and bleaching treatment is very smooth. Without the above phenomenon, it must be observed and measured more carefully. The impurities of the B cargo are processed. Processing the filling glue, floating
5, density, hardness, refractive index
The jadeite treated by bleaching and filling has a majority density and a slightly lower refractive index. The density is 3.00 to 3.43 g/cm, and the refractive index is about 1.65 (point measurement). However, due to the complex mineral composition of jadeite, the density and refractive index of some natural jadeites may also be low, so the density and refractive index can only be used as reference data, and can not be used as a basis for determining whether jadeite is filled. Determine hardness and density. 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.
6, fluorescence
No or weak to strong UV fluorescence, uniform fluorescence distribution or plaque. Most of the early "B goods" jade has fluorescence. Short wave: weak, yellowish green or blue-green (blue and white); long wave: medium to strong, yellowish green or blue and white. However, the jade treated by this method usually has weak or no fluorescence intensity.
7, zoom in and put
Enlarged inspection Enlarged inspection is an effective way to identify this treatment of jade. Divided into surface observation and internal observation.
8, thermal reaction
"B goods" jade heating 200 ~ 300 ° C after the gum carbonization.
9, knocking reaction
Hanging the jewelry with a thin line of hair, etc., and gently colliding with agate or A jade, it will make a very melodious, clear-talking sound, the sound is more crisp and pleasing to the ear, there is a sense of metal; the sound of B goods is boring, Not crisp, no pleasant sound. After the bleaching and filling of the jade, the structure is destroyed and the mineral particles are filled with colloid. Therefore, after a light tap, the dull sound is clearly different from the natural jade crisp sound (this method is mainly suitable for the identification of jade bracelets).
Judging the sound, the sound of natural jade is clear and loud. We can use the agate stick to tap and listen to its voice to judge. However, the sound can only be used as a reference, because some of the B-good craftsmanship can make the sound sound very clear and loud, similar to the real Burmese jade.
10, feel
Natural jade A goods touch is a cool glass texture. The treated jadeite B and C goods have a greasy feel when touched.
11. Identification of jade by water droplet method
The use of the physical properties of jade to identify the true and false of jade is to drop a drop of water on the jade. If it is true jade, the water droplets will appear in the shape of dew on the jade, and will not spread; if it is fake jade, the water droplets may immediately It spreads or slips. This is a method that people often use.
12, weight
The weight A is slightly heavier and has a thick feeling in the hand. The density can also be measured with an instrument, and the jadeite is around 3.30.
13. Check the jade certificate
Many people often ignore the professional identification certificate of jade when purchasing jade, but the certificate of authentication is an important reference when purchasing. The certificate will generally have all the information of this jadeite, which can be checked one by one. It should be noted that the tag of the physical object and the number on the photo must match.
No matter which kind of jewelry and crafts made from Burmese jade, we hope to buy authentic A goods. Jadeite A is a pure natural jadeite. It has not been processed in the later stage, and its value is high, and the appreciation space is large.
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