How to evaluate the quality of jadeite

Jade raw materials vary widely, high-grade raw materials less than 1000 grams of small pieces, worth tens of millions or even more than 100 million yuan, a few tons of jade raw materials may only be tens of dollars per kilogram, the value difference is 10,000 times. It can also be said that jade is the only gem that does not measure its value by weight. Because of this, the quality assessment of jadeite is even more important.

How to evaluate the quality of a piece of jadeite material is a question that many experts study and think about. Based on the existing research results, we can analyze from the following aspects:

(a) color:

Color is the most important factor in evaluating jade. The highest value of jadeite is green, followed by red, enamel pink, etc. The quality of color directly affects the value of jade. To consider the quality of the color, it is necessary to specifically analyze whether the color of the jade is positive, whether the color is suitable, the color is warm and cold, and the color distribution is uniform.

1. Emerald color is purely ideal, but the jadeite produced in nature is often not pure, some are yellowish, some are blue, and some jade have gray tones. We use pure green as the best, and then divide the number of files according to the strength of the face, so that we can roughly grasp the classification and grade of the color.

2, the color of the shade is also very important, too strong color will affect the transparency, too shallow and too light to look good. It is generally believed that the color of jadeite is better for the shade. Depending on the region, people also have a preference for color shades. People in high latitudes generally prefer slightly darker colors. People in low latitudes generally prefer lighter colors. Ages also have a preference for color. Change, older people like to have a darker color, most young people prefer lighter colors; because of differences in personality, people's preference for color will be different. Most introverted people prefer slightly darker colors and extroverted personality. Most people like to be lighter and more beautiful.

3, the color of the jade color is warm and cold, the yellowish color is more than the warm color component, and the blue color is the cold color component. The color cast of the color will be related to the brilliance of the jade. Some people also describe the degree of black and gray to describe the glamorous color of the jade color. The darker the black and gray, the worse the color of the jade. Based on our own experience, we can grade the brilliance of the jade color and develop the difference between each level. This is important for the evaluation of the value of jade.

4. The distribution of colors on a piece of jade is also very important. The more uniform the color, the better. The uniform distribution of the color of the jadeite material for jewelry is important and sometimes a decisive factor. The use of jadeite jade materials depends on the distribution characteristics of the color. The green color of some raw materials is the distribution of the bands. It depends on the width, direction and shape of the ribbon. The distribution characteristics of the ribbon will determine the design and processing methods of the jade. The color of the raw materials is agglomerate, and some are a line. Only after studying the characteristics of the color can the design of the jade be determined, which directly affects the quality of the finished jade. The use of jade color is good, and the use of this piece of raw materials is maximized, so that it can maximize its value.

(2) Transparency

Emerald is a rock, a collection of polycrystals dominated by jadeite minerals, mostly translucent and even opaque. The best emeralds are not as transparent as single crystal gemstones such as emeralds. Perhaps because of this, the Chinese prefer jade, and they like the emerald's semi-transparent, watery feeling.

The crystal grain size, arrangement, and impurity content of the jadeite minerals that make up the jadeite have a direct impact on their transparency. Generally, jadeites refer to transparency as "species" and "water". Good transparency means that the water is sufficient and the seed is good; if the transparency is poor, the difference is poor or the water is very dry. Some homes are very vocabulary words to express the transparency of jade, such as: glass, ice, dry green and so on.

The better the transparency of jade raw materials, the higher the value. Especially when evaluating high-grade jadeite, the effect of transparency on value is often higher than color. Non-colored and non-species must not be high-end goods, and a certain color and good jade can become high-end goods. It can be said that high-grade jade must be good, and good color is not necessarily high-grade jade. For low-end jade, color is no more expensive than colorless, in which case color is more important than transparency. The careful appraisers will sum up the approximate price difference between the good and the bad of the jade, the more statistical calculations, the more representative, the difference in the price of the jadeite of different species, which is very useful for the comparative analysis of the evaluation objects. .

(3) Structure

The jadeite structure we are talking about here refers to the thickness of the crystal particles of the jadeite minerals that make up the jadeite, the shape of the crystal body and the way of its combination. The experts call it "bottom" or "ground".

Generally speaking, the smaller the crystalline particles of jadeite mineral, the finer the texture of jadeite; the coarser the crystal of jadeite mineral, the worse the texture of jadeite, the less delicate, the poorer the polishing effect and the lower the price.

We can roughly divide the texture of jade into several categories, from very fine-fine-thicker-rough-very thick. The general jade texture is very fine, and it can also analyze jade raw materials according to the quality of the land. The difference in price, by studying the general law, will make it easier to know the extent of the influence of "land" on the value of jadeite.

(4) Cleanliness

Jade's evaluation is like other gems, and the cleanliness directly affects its value.

The jadeite is mainly white and black. Some black enamels are distributed in dots, and there are also filaments and ribbons, mainly black minerals such as hornblende. White mites are mainly distributed in blocks and grains, generally called stone flowers, blisters, etc., mainly white jadeite, minerals and feldspar minerals.

In the evaluation of jadeite, it is necessary to study the size and distribution characteristics of cockroaches, whether it can be eliminated, whether it has a significant impact on the quality of jadeite, and the extent of the impact. After comprehensive analysis, the degree of influence on the value of jadeite is determined.

Cracks, if there is a large crack on a piece of jade material, this will greatly affect its value. The degree of influence is judged by factors such as the size, depth, and position of the crack.

In the evaluation of jade raw materials, the above five points should be comprehensively analyzed and studied. First, we must determine whether the jadeite material is a jewellery material or a jade carving material. The evaluation methods of the two materials are different. The jewellery material is more direct and more specific; and the jade carving material is more complicated and more abstract. Not only must we consider the quality of the material and the distribution characteristics of the color, but also what can be done, how to do it, and what the effect will be. For example, a piece of black, green, and white material, if the three colors are fully utilized and designed into a great piece of art, its value will multiply. If the design is not good, it will greatly affect its value.

It is worth reminding that there are many factors affecting the value of jadeite, each of which is dynamic and uncertain, which is why the value law of jadeite is difficult to determine. The peers engaged in jade evaluation research can only correctly grasp the evaluation of jade raw materials and finished products by continuously summing up the experience, collecting as much data as possible, and finding the dialectical relationship and laws between the factors affecting the value of jadeite.