The pictures and text will teach you how to identify the A-grade and B-grade jadeite. It is very easy to learn. Come and learn if you don’t want to be fooled.

The so-called B-grade jadeite refers to natural jadeite of poor quality that has been soaked in acid to remove dirt and yellowing, and then injected with glue (glue injection is not required when the acid washing is light) to improve its quality, water content, and color. Since its key step is the pickling process, it is also called "bathing" or "showering" jade in southern my country.

A-grade jade (jade that has not been chemically treated, only physically carved and polished) will become more moisturized after years of wearing, and it will also benefit the human body through constant contact and friction with human skin. The wearer will also feel very happy, which is what the saying "people nourish jade, and jade nourishes people" means.

However, B-grade jadeite cannot stand the test of time and its quality will deteriorate. This is because B-grade jade is corroded by acid during the processing process. Although the dirt in the jade is removed and the transparency is increased, tiny cracks and voids appear in the structure of the jade. Therefore, glue is pressed into the cracks and voids under high temperature and high pressure to create "natural jade that looks like high-end jade." However, as time goes by, the glue filling the jade will gradually age and fall off, and the jade will become spotted and lose its luster.

Grade B jade is made from low-grade jade materials and is generally used to imitate high-end grade A jade. The market is flooded with a large amount of grade B jade, which has a far greater value than grade A jade. Because B-grade jade has been processed, its natural structure is destroyed and becomes loose, thus reducing the quality of the jade. Its price should be much cheaper than A-grade jade of the same quality. Often dozens or hundreds of tons of brick materials are processed by pickling, and the total cost of making a jade bracelet in this way is only a few dozen yuan. Therefore, when purchasing jadeite, you must be able to distinguish between A-grade and B-grade jadeite.

B-grade jadeite can be identified from the following aspects:

At first glance, the color of B-grade jadeite is less bright, but the green color mostly has no color roots, and the contrast between color and ground is too strong, which looks unnatural. Due to bleaching and filling, B-grade jadeite is uniform and clean overall, the base becomes white, and secondary colors such as yellow, brown, and red disappear. When observed under light, the base appears pale.

Second, look at the gloss. The luster of B-grade jadeite is weaker, mostly resinous, and inferior to the near-glass luster of A-grade jadeite. No matter how poor the quality of A-grade jadeite is, it will have a glassy luster after polishing. The solid texture and glassy luster can often distinguish A-grade jadeite from B-grade jadeite.

Third, look at the structure. B-grade jadeite is relatively loose, and upon magnification inspection, it can be seen that the crystal particles are offset and displaced, losing their directionality. When observed through light, A-grade jadeite has high transparency and fine grains, while B-grade jadeite often has large grains but higher transparency, showing an inconsistency in transparency and structure.

In addition, using a magnifying glass you can observe that the surface of B-grade jade has pits and pockmarks like orange peel, which is called the "orange peel effect." Due to the injection of glue, B-grade jade appears pink-blue or yellow-green in fluorescence under ultraviolet fluorescent light. Gently tapping a B-grade jade bracelet will produce a dull sound, while an A-grade jade bracelet will produce a crisp and pleasant sound.

Learn to read jade certificates

In fact, one of the most effective ways to identify the authenticity of jade is to ask the seller to provide an appraisal certificate issued by a national authoritative agency. The appraisal certificates issued by national authoritative organizations have a very high accuracy in jade appraisal. It should be said that there are rarely "missing goods". Even if there are problems, compensation can be sought. The "important skill" that collectors are required to possess here is how to understand the various results on the appraisal certificate.

The jade certificate issued by a national authoritative organization will only have the word "jade" in its appraisal result item if it is natural A-grade jade, and it will not include words such as "A-grade" or "natural".

Please pay attention to the following aspects:

First, only natural A-grade jade will be issued with a certificate stating that it is "jade".

Second, if it is B-grade jadeite, the certificate’s appraisal results will state “Jadeite (processed)”, “Jadeite (glue injected)”, “Jadeite (B-grade)” or “Jadeite (optimized)”.

Third, C-grade jadeite will be marked with “Jadeite (dyed)”.

Fourth, for D-grade jadeite, the word "jadeite" will not appear in the appraisal certificate. If it is a substitute, the name of the substitute will be indicated, such as "artificial glass", "dyed quartzite", "Xiuan jade", "Malay jade", etc.

Fifth, the certificates should correspond one to one, that is, one certificate for each item, and the certificate should contain a picture and weight of the item.

Although some items come from the same raw material and look similar in appearance, no two jade jewelry are exactly alike.

Just because one item has a certificate does not prove the quality of the entire batch of items. In order to save costs, some merchants only have a sample certificate. The goods in the photo are very similar to the real thing. This does not mean that the goods they sell are all natural. This practice does not comply with national regulations.

Sixth, some basic physical, chemical and optical characteristics of jade should also be indicated on the certificate.

[Refractive Index]: 1.66 (This is the refractive index of jadeite that is unique to it and different from other gemstones);

[Density]: 3.33-3.35 (also the characteristic that distinguishes jadeite from other gemstones);

[Magnification Detection]: Fiber interlaced structure (this is a structure unique to jadeite);

【Absorption spectrum】: 437nm absorption line (a unique absorption spectrum of jadeite);

[Color filter inspection]: No reaction (some dyed jadeite will turn red under a color filter);

【Optical property】: ** body (Jade is a micro-mineral ** body);

【Fluorescence】: None (some B-grade products will have fluorescent reaction after injection);

[Appearance characteristics]: Glass luster (some B-grade products will have a waxy luster).

Finally, the signature of the inspector is required, and the most important point is that there must be a steel stamp or anti-counterfeiting mark on the certificate.

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