Teach you the easiest way to identify jadeite

1. Color: Since the structure of jade is destroyed, the original optical properties are also changed, so the color distribution of "B-grade expanded jade" has no sense of hierarchy. Although the green color of jade treated by this method is still the original color, after being soaked in acidic solution, the base becomes white, the green distribution is more floating, and the original color orientation is also destroyed, which looks very unnatural.

2. Luster: After being soaked in strong acid and alkali, the structure of jade becomes loose, and before filling, corrosion pits appear on the surface, which causes diffuse reflection and weakens the luster. After adding organic fillers such as resin or plastic, jade often has resin luster, waxy luster, or a mixture of glass luster with resin luster and waxy luster.

3. Structure: After jade is soaked and corroded by strong acids and alkalis, some substances are brought in and out, forming dissolution along the mineral crystals on the surface and inside, and producing internal interconnected cracks. Under transmitted light, the crisscrossing cracks inside can be seen. Under reflected light conditions, the surface dissolution pits or spider-web-like patterns are clearly visible.

4. Surface characteristics: Jadeite processed by this method has obvious grooves at the original cracks due to the large difference in hardness between the filler and the jadeite itself. The filling is obviously lower than the two sides, and many cracks form criss-crossing ditches. Cementation or residual bubbles can be seen in the larger "ditches". The surface of jadeite processed by bleaching and filling with better processing technology is very smooth, without the above phenomenon, and requires more careful observation and measurement.

5. Density and refractive index: The density and refractive index of most jadeite that has been bleached and filled are slightly lower. The density is 3.00~3.43g/cm, and the refractive index is about 1.65 (point measurement). However, due to the complex mineral composition of jade, the density and refractive index values ​​of some natural jade may be low. Therefore, the density and refractive index can only be used as reference data and usually cannot be used as a basis for determining whether jade has been filled.

6. Fluorescence: no or weak to strong ultraviolet fluorescence, the fluorescence distribution is uniform or mottled. Most of the early "B-grade" jadeite has 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 or no fluorescence.

7. Magnified inspection: Magnified inspection is an effective method to identify this kind of processed jadeite. It is divided into surface observation and internal observation.

8. Thermal reaction: When “B-grade” jadeite is heated to 200-300℃, the gum will carbonize.

9. Tapping reaction: The structure of jadeite is destroyed after bleaching and filling, and the mineral particles are filled with gum. Therefore, it will make a dull sound when tapped gently, which is significantly different from the crisp sound of natural jade (this method is mainly suitable for identifying jade bracelets).

Jadeite, also known as jadeite jade, jadeite and Burmese jade, is a type of jade. The correct definition of jadeite is a fibrous aggregate composed of pyroxene minerals, mainly jadeite minerals. But jadeite is not the same as jadeite. Jade is a stone polycrystalline aggregate that reaches the jade grade under geological action. It is mainly composed of jadeite or jadeite and sodium (sodium chrome pyroxene) and sodium calcium pyroxene (diopside). It may contain amphibole, feldspar, chromite, limonite, etc.

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