If you don't have the qualification to be appraised by an authoritative jewelry and jade institution, you can appraise it by the following methods:
1, gloss. After soaking in strong acid and alkali, jadeite has loose structure, and there are pits on the surface before it is full, which makes it spread and its luster weaken. After adding organic fillers such as resin or plastic, jadeite often appears resin luster or wax luster, or glass luster mixed with resin luster and wax luster.
2. color. Because the structure of jadeite has been destroyed, the original optical properties have also changed, and the color distribution of jadeite in B Goods Expansion has no sense of hierarchy. Although the green color of jadeite treated by this method is still the original color, after soaking in acid solution, the background color turns white, the green distribution floats, and the orientation of the original color is also destroyed, which looks unnatural.
3. structure. After the jadeite is corroded by strong acid and alkali, some substances are brought in and out, and corrosion is formed on the surface and inside along the mineral crystal, resulting in internal connected cracks. Under the irradiation of transmitted light, we can see the crisscross cracks inside. Under the condition of reflected light, the corrosion pits or cobweb network structure on the surface are clearly visible.
4. Surface features. The hardness of jadeite treated by this method is quite different from that of jadeite itself. There are obvious gullies in the primary cracks, and the fillings are obviously lower than those on both sides. Many cracks form crisscross gullies. Cements or residual bubbles can be seen in large "ditches". The surface of jadeite treated by bleaching and filling with better processing technology is very smooth, and there is no such phenomenon, which needs more careful observation and judgment.
5. Density and refractive index. Most jadeites that have been bleached and filled have slightly lower density and refractive index. The density is 3.33 ~ 3.34 g/cm, and the refractive index is about 1.66 (spot measurement). However, due to the complex mineral composition of jadeite, the density and refractive index of some natural jadeite may be low, so the density and refractive index can only be used as reference data, and usually cannot be used as a basis for judging whether jadeite is filled.
6. Fluorescence. There is no or weak strong ultraviolet fluorescence, and the fluorescence distribution is uniform or patchy. Most of the early "B-goods" jadeites have fluorescence. Short wave: weak, yellow-green or blue-green (blue-white); Long wave: medium to strong, yellow-green or blue-white. However, jadeite treated by this method usually has weak fluorescence intensity or no fluorescence.
7 Zoom in and check the release. Magnification inspection is an effective method to identify this treatment of jadeite. Divided into surface observation and internal observation. By observing the surface of the sample with reflected light, we can usually see three situations: ① Spider-like or grooved cracks with relatively uniform distribution can be clearly seen on the surface. This must be bleached and filled with jade. But it should be distinguished from the pockmarked surface caused by poor polishing. The crack edge of jadeite treated by bleaching and filling is smooth, and "emerald" is not obvious; However, pits formed by poor polishing are mostly triangular, with sharp edges and uneven distribution, and most of them appear as coarse particles, which are obviously "emeralds". ② Surface polishing is good, but local small cracks are relatively concentrated. This is because the jadeite is bleached and filled, and then carefully polished, which makes the surface smoother. The local tiny cracks are the expression that the tiny gaps between the destroyed jadeite particles are not completely filled. ③ The surface is extremely smooth, with few tiny cracks, but there are many bright spots similar to "emerald" reflection on the surface. Bright spots are often distributed on the surface or inside of coarse particles, rather than flaky flashes on cleavage surfaces. Under the high-power microscope, we can see that many small bright spots are small bubbles, which are preserved because the air in the gap is not completely evacuated during the filling treatment. Observing the internal structure of jadeite with transmitted light. The jadeite treated by bleaching and filling has loose structure, blurred grain boundaries, broken particles and incoherent cleavage.
The A product of jadeite is natural jadeite, which is naturally produced. It is only processed, carved, polished and polished by physical methods, and its internal structure has not been damaged by any chemical or irradiation methods. Goods B are jadeite after pickling, bleaching and glue injection. C goods (dyed jadeite. Whether it is acid leaching bleaching or filling with glue, artificially colored jadeite is called C goods.
It can be seen that the fake jade bracelet will have certain chemical residues after artificial chemical treatment. Wearing them may not cause obvious harm immediately, but with the intake of skin sweat and sebum, long-term wearing is inevitable. So don't wear fake jade bracelets, which is a guarantee for your health.
Natural jade bracelet icon: