Increase your knowledge! How to grade and maintain black jadeite?

With the continuous rise of the jade market, black jade is becoming more and more popular among people. But in the eyes of many people, all black jadeite seems to be the same, all black, and it seems impossible to tell the value. We know that although there is a set of corresponding jade grading standards in the jade industry, do you know how black jade is graded?

Grading of Jadeite

Nowadays, there is indeed no detailed and systematic classification and description of the texture grade of black jadeite in the jade market. However, wisdom comes from practice. Some merchants or players use terms such as "ice-type black jadeite" and "glass-type black jadeite" in practice. Regardless of whether it is scientific, at least there is an explanation.

Some people say that since black jadeite is a type of jadeite, the jadeite grade classification standards should also apply to black jadeite. Therefore, the grading of black jade should start from the following points:

1. Seed

The national jade grading standards regarding texture grades and partial classification of jade species can all be used for black jade. The coarseness of the grains that make up jadeite and the density of its structure affect the intensity of its surface gloss.

2. Water

Water refers to transparency. The "water" in black jade can be translated as its transparency when illuminated by transmitted light. The tighter the structure and the finer the grains, the higher the light transmittance.

3. Color

The evaluation of jade color refers to how rich, bright, positive and harmonious the green is. When applied to black jadeite, it is required that the black color on the surface of the black jadeite and the green color under transmitted light be rich, bright, positive and harmonious.

4. Clarity

Clarity refers to the degree of internal defects. The level of clarity is determined by the amount of defects such as cotton and impurities. The factors that affect clarity are complex and diverse.

5. Crack

It is divided according to factors such as the location of appearance, length, and type. Before an industry is fully mature, what we need is to flexibly apply our experience to solve the problems encountered in our work. There are many factors that affect the quality of jadeite, and each factor is dynamic and uncertain.

Black jade and jadeite seem to have an unclear relationship. When the black jadeite evaluation system was in a blank stage, the jadeite template system was revised and applied to black jadeite, which solved the problem of how to identify the quality of black jadeite. It is convenient and easy to understand.

Maintenance of Jade

1. Black jade also needs to be cleaned

Clean the black jadeite regularly: soak it in clean water for 30 minutes. If its surface becomes dirty due to long-term wear, just gently scrub the black jadeite with a small soft brush after soaking. Such corrosive substances will hardly remain on the surface of the black jade for a long time and damage it. At the same time, they can replenish the "moisture" lost by the black jade in the high temperature in summer or when you wash it.

In addition: Each time you clean, pay attention to whether the hanging rope is worn or the inlaid jewelry is loose. This way, timely inspection and maintenance can be discovered and sent back to the store for maintenance to avoid the jadeite being broken or lost due to the broken hanging rope or loose inlay.

2. Summer care

Although it is winter now, we should also know some summer maintenance tips for black jadeite. People sweat more in summer, and the salt, volatile fatty acids, urea and other substances contained in human sweat will slowly erode the surface of the jadeite. This destroys the brightness and luster of the jadeite. Therefore, it is best not to play with black jade in your hands in summer.

As for accessories that are worn close to the skin, such as bracelets and pendants, they should be cleaned manually with neutral detergent frequently. If the carvings are difficult, you can brush them lightly with a soft brush (various brushes are also good choices) and put them in a cool place to dry. Remember!! Jadeite jewelry should also avoid long-term contact with acids, alkalis and organic solvents, such as various cosmetics, perfumes, hairdressing products, etc., which will corrode its surface.

3. Black jade is afraid of high temperature

After being roasted, the volume of its internal molecules will increase, causing the jade quality to change. It will cause the jade to lose its warm moisture, making its seed dry and its color lighter. Therefore, when visiting places such as beaches with strong sunlight, try not to wear jadeite jewelry to avoid direct exposure to strong sunlight.

For friends who like to take a sauna, they should also take off the black jade ornaments before entering the sauna room, and do not let black jade be in a high temperature and humid environment for a long time; when cooking, try to avoid contact between black jade and high temperature or open flame. It is best to remove the black jade ornaments when cooking to prevent damage to the jade.

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