First, the texture should be old. Emerald is divided into three types: old pit, old pit and new pit. The "old pit" is the best, and the jade is crystal clear because of its long geological age; On the contrary, it is called "water difference", that is, jade with low transparency and looseness. Generally speaking, jade is transparent or nearly transparent. When struck with a hard instrument, the crisp, loud and pleasant sound is the best.
The second is positive color. The color of jadeite is very particular. Experts divide jadeite into three grades: A, B and C. Grade A is a pure natural product, that is, the color of natural jade and original stone, commonly known as "positive color". It does not undergo any "internal treatment", and the water color will never change. Most jadeites have extremely fine cracks. Therefore, Grade A jadeite is more or less flawed or deficient. Grade B jadeite is opaque because there are many impurities. In order to change the color of this jade, a variety of strong acids commonly known as "plum acid" are generally used to make it green and transparent. Although it is emerald in appearance, there are almost no flaws, but many molecular structures in jade are destroyed and easily broken after one or two years of use; Grade C jadeite is dyed jadeite, commonly known as "electric color" and "colored". Repeated heating with chemicals forces the "lattice" elements to turn green, red or purple, which looks very bright, but it can not stand the test of time, and it is easier to see the traces of artificial dyeing. Electro-color jade is not bright, the color is not bright, and it will reflect lines to light. Some of them don't show fine lines, but they look muddy. If it is put into molten wax, the injected high-hardness plastic slurry and color will slowly separate out (this test will not damage jade), and the color of jade is easy to fade and uneven, commonly known as "evil color". Jewelry stores generally use Chelsea filters to detect the authenticity of jadeite. This is a special kind of gray-green glass, which can absorb yellow-green light and transmit crimson light, so the undyed jadeite original stone can show a white gray-silver layer with a filter. The dyed jadeite is forcibly inserted into the "inscription" element, so a red or purplish red layer appears under the filter.
Generally speaking, green is the best jadeite, in which the color is green as a young leaf, the luster is like fat, and the translucency is better. Green, white, red and green are the most. People call the most transparent jadeite "glass seed", which gives people a green color with abundant business. Only emeralds can match it and have the highest value. Gradually become purple, cyan, red and gray. The worst are black and cat urine. Generally speaking, the more emerald green parts, the more uniform the better; On the contrary, light green, dark green and old green, followed by evil and green flowers. As the jargon says, "green is expensive, and black is cheap."
A beautiful piece of jade. It should be light green, the color is like holly, delicate and dripping, and the luster is even and bright. Specifically, it can be judged from four aspects: color intensity, positive color, correct color and harmonious color. The color is strong, indicating that the green is strong and there is a god; The color Yang is dazzling green; Positive color, that is, there is no impurity in green; Color harmony is uniform and green.
In addition, the choice of jade should also pay attention to the background color and should not be underestimated. Background color refers to places other than green. Glass and lake bottom are better, while white, purple flowers and bean green bottom are average; Ivory color, stone gray color and taro color are poor, but slightly better than dark cloud color and cat urine color. The background color should be uniform, without mottled spots.
The third is transparency hardness. High-grade jadeite is more transparent. Dark colors and oily mud are not delicious. People divide the hardness of minerals into 10 grades from soft to hard, and natural jadeite is generally above grade 6, which is very hard and can't be scratched with a knife.
Fourth, the shape is perfect. No matter what shape the jadeite is, it must be fine in workmanship and normal and perfect in shape. Boundary modeling requires avoiding uneven thickness, irregular geometry and too small volume. A piece of high-quality jade material, after careful carving, can be worth millions. There are two kinds of fake jadeites in the market: colored jadeite and imitation jadeite. Colored jadeite is made of white jade, or low-grade serpentine, Australian jade, Korean stone, marble and so on. Observing this fake under strong light, you can see that the green color is all in the grain, the grain is messy and small, and the weight is lighter than the real one. In addition, there are all kinds of jadeite mixed with garnet, Dongling stone, green pill and jasper, and the appearance color of these jadeites is almost the same as that of jadeite. However, the color of real jadeite is different when observed in different light, while fake jadeite has an arc-shaped yellow film on its surface in the sun. In addition, they are different in hardness, specific gravity, germplasm structure and so on, and can only be easily distinguished by careful comparison. The imitation of the material is made of glass, which is artificially melted. Although green is relatively uniform, it is dark with tiny bubbles, and it is hoarse when struck with hard instruments because of its loose structure. When consumers buy high-value jadeite, they must ask experts for appraisal, or pay after professional inspectors issue an appraisal book to prevent mistakes.
If you buy it online, it is recommended to go to Yuyuanxuan Emerald Mall. Their shopping malls focus on medium and high quality, because I understand it myself. I am satisfied with the service and quality of this house. The important thing is that it is much cheaper than the market.