Look at the transparency of its texture first. Transparency refers to the light transmission degree of jadeite, which is divided into several grades, such as micro-transparency, semi-transparency, micro-semi-transparency, opacity and so on. Too many cracks and impurities will affect the color, transparency and polishing brightness. The existence of cracks, especially penetrating cracks, will greatly reduce the price of jadeite. Texture refers to the quality of the green surrounding environment of jade. Including the fineness of minerals, the number of cracks and impurities, transparency, color and overall coordination with green. Texture is actually a comprehensive evaluation sign and an intuitive impression. The quality of texture represents the quality of jadeite to a certain extent. Generally speaking, jadeite is transparent or transparent, and experts call it "old jade", which has the highest value. Translucent jade is called "new and old species", followed by price. Jade is opaque, and the dried jade is called "new kind of jade", which has low value. The second is to look at the color. The color of jadeite is ever-changing, with dark green, red and violet as the best. Green is the most expensive. The evaluation of green quality is measured by the words "strong, sunny, savage, positive and harmonious", which means: strong: green, dark green, dark green but without black tone. Yang: aboveboard, neither gray nor black. Joe: It's beautiful and crystal clear, which means youth. Positive: Green is pure, and there are no variegated colors such as blue and cyan in green. Harmony: Green is uniform, harmonious, non-flowered and non-chaotic. The order of green varieties is green, grayish green, yellow-green, grayish green and grayish green. Note: the evaluation of green should not be carried out under strong light, transmitted light, but naturally reflected light. Jade is rich in colors, such as green, red, purple, gray, yellow and white, among which green is the most precious. According to the depth of green, it is divided into many kinds, such as ruby green, brilliant green and glass green 10. High-quality jadeite is green, rich, transparent, oily and free of impurities. When struck with a hard instrument, the sound is crisp and loud. Commercially, jadeite is divided into three grades: super grade: also known as imperial jadeite, the color is green (emerald), and the color is pure, rich, uniform and transparent. Fine texture, no cracks. This kind of jadeite is very rare and extremely expensive. Commercial grade: also known as commercial jadeite. The green color of this jadeite is often mixed with other colors. Green canvas is uneven, translucent-opaque, dense and delicate in texture, bright in color and high in transparency, and expensive. Ordinary grade: Also known as ordinary jadeite, the color is mostly dark green, such as light green, bean green, spinach green, oil green, etc., with different shades, uneven distribution, mostly opaque, rough structure and frequent cracks. High-quality products can be used for jewelry, mostly for making handicrafts. The maintenance of jadeite has strong toughness. However, some consumers misunderstand that they are not afraid to fight. I don't know that jade also needs careful maintenance to keep its feminine beauty unchanged. When wearing jade pieces, try to avoid falling from a height or hitting hard objects, especially jade pieces with a few cracks. Otherwise, jade pieces are easily broken or damaged. Jade is a symbol of elegance and sacredness. If you are exposed to oil pollution for a long time, oil pollution can easily accumulate on the surface of jade, affecting its luster. Sometimes dirty oil stains will fill up along the cracks of jade pieces, which is very unsightly. So when wearing jade, be sure to keep it clean. When neutral washing, it must be washed with a soft cloth, dried and polished with silk. Jade carvings are often painted with Sichuan wax to enhance their beauty. Therefore, jade can't contact with acid, alkali and organic solvents. Even if it is not waxed jade, because they are a collection of multi-minerals, long-term contact with acid and alkali should be avoided. These chemicals will corrode the surface of jade. How to identify jadeite jadeite, jadeite A, jadeite B, jadeite C, albite jadeite (Bashan jade), sodium chrome pyroxene jadeite, Australian jade and Malaysian jade? Many geophysicists in the United States have done a lot of simulation experiments in the laboratory, and combined with the actual situation of discovering jadeite deposits all over the world, they think that jadeite was not formed at high temperature, but deteriorated at extremely high pressure of medium and low temperature. Ichiro Shachuan, a professor at Northeastern University, pointed out in his book Talking about Gems (published in 1983) that jadeite was formed at 10,000 atmospheres and relatively low temperature (200-300oC). We know that the deeper the temperature, the greater the pressure from the surface of the earth to the depths. But jadeite is crystallized at low temperature and high pressure, and of course it can't be in a deeper part. So where does the high pressure come from? It has been proved that this high pressure is caused by the compressive force produced by crustal movement. All jadeite deposits are distributed in areas with strong crustal movement. Emerald, also known as Burmese jade, is jadeite produced in Myanmar. Emerald is produced in Japan, the Soviet Union, Mexico and California, but its quality and output are far less than that of Myanmar. Jadeite is the main mineral of jadeite, and its chemical formula is NaAl(Si2O6). The theoretical composition is silica 59.44%, alumina 25.22%, and sodium fluoride 15.34%. However, except jadeite, natural jadeite always contains other minerals of pyroxene family, but they are mainly the following three kinds: jadeite A refers to jadeite that is naturally produced and has not been artificially destroyed by physical and chemical methods or brought in or brought out by substances. Jade that has been decontaminated by weak acid and weak alkali and waxed by traditional technology is also A goods. During the processing of jadeite jewelry, bleaching and waxing are very important traditional processes. For different jade ornaments, one or two of them can be used to optimize, thus improving the aesthetics and durability of jade ornaments. In the national standard "Name of Jewelry and Jade", traditional craft is listed as optimization. Therefore, in the test report or appraisal certificate, there is no need to indicate bleaching and waxing, indicating that bleaching-only waxing on the surface-can increase the smoothness of the jade jewelry surface. Jade B goods refer to those raw materials or finished products with yellow, gray and black spots and good green, which are removed by manual treatment (chemical reagent melting spots and glue filling) to increase transparency and make their original green look pure. The physical and chemical treatment of B goods is to improve the grade of jadeite, but through the treatment, the structure of jadeite is destroyed, becoming loose, the quality is reduced, and some optical and physical properties are changed, so it can't be compared with untreated jadeite at all, and the price is much lower. The preparation process is as follows: firstly, different acids are selected according to different mineral components to be removed, and the samples are soaked for several days, and the time is subject to the removal of spots; At this time, the minerals filling the gaps or cracks are dissolved, which makes the structure of jadeite loose. Therefore, strong adhesive glue must be used for filling and bonding. To choose the glue with the same color as Yudi, epoxy resin glue is generally used; Then put the sample coated with glue on tin foil and heat it in microwave oven to make the glue penetrate into the gap and solidify (sometimes under high pressure vacuum); Finally, use a knife to scrape off the excess glue flowing out of the crack to the surface of the sample. Due to the resin filling of B jadeite, the surface gloss of jadeite will become worse, the transparency may also change, and the color will change slightly after a long time. Jade C goods Jade C goods refer to jadeite that has been artificially dyed as colorless and light green jade (there are many dyeing methods, some of which will destroy the structure, but the pigment only exists between jadeite crystals). The color of C goods is easy to be returned, and the production history is long, and it is constantly updated, and "new products" appear constantly. The production process is as follows: firstly, choose a suitable jadeite, which generally has a certain porosity, and the particularly dense jadeite cannot be dyed; Next, the dyed jadeite jade should be strictly cleaned, and dilute acid should be often added to remove oil stains or surface impurities; Then putting the jadeite jade into a drying box for drying, and soaking the jadeite jade in dye or pigment after drying; Heat it slightly to accelerate the penetration of the solution into the pores of jadeite. The time depends on the quality of jadeite, and it usually takes 1~2 weeks. Soak the partially colored jadeite, and then soak a layer of wax after drying to make its color distribution softer. Albite jadeite (Bashan Jade) 1983 A new type of jadeite has been discovered in northern Myanmar, which is called "Basan Jade" and "Mountaineering Jade", and some are called "hard sodium jade" and "albite jadeite". The petrological name of Bashan jade is "Erosion Jade". Micro-cracks, micro-cracks and crystal gaps between grains of Basanyu are well developed, and cleavage of jadeite is also very common during deformation. Its mineral composition is mainly jadeite. Basanyu should be located in jadeite jade (90%). Because the internal structure of Bashan jade is loose, most of it needs to be optimized. The interior and exterior of Bashan jade are improved by polymer filling. Bashan jade "B goods" is the best example of polymer filling optimization treatment, which makes jade feel the best and makes the most effective use of jade resources. Sodium chrome pyroxene jadeite, also known as Tianlong hard jadeite, was basically mined in 2000, and the minerals were collected by some bosses and are still traded in the market. The mineral composition of Tianlong raw jadeite is mainly chrome jadeite, which is green in color, especially bright and even. The jadeite containing chromium contains 2-5% of Cr2O3, and its color is green and bright, with Cr2O3 >: 5% and Fe, and its color is green and dark. Australian jade refers to a kind of chrysoprase produced in Australia, that is, aphanitic is translucent green in time, which is very similar to high-grade jade. Ma Laiyu Ma Laiyu is not produced in Malaysia, so it is called Malaysian jade, because it was originally sold in Malaysia. It is polycrystalline and can be divided into two types: one is dyed quartzite, and jade is considered to be the most diverse and complicated among all jewels and jade. So how to buy jade jewelry? Relevant experts remind consumers that they can start from six aspects: color, structure, transparency, clarity, cutting and weight. Color--the key factor in jadeite quality evaluation system. The requirements for color are purity, richness, uniformity and harmony. High-grade jadeite should have pure green. Tones of green and gray, brown, brown and black with slight yellow tone adjusters are considered as miscellaneous tones. The stronger the variegated color, the better the color quality of jadeite. High-grade jadeite requires rich colors, that is, saturated colors, moderate brightness, too light colors, bright colors but not gorgeous, too thick jadeite, reduced transparency and a sticky feeling. The color of natural jadeite is mostly filiform and flaky, so it is difficult to achieve uniformity. If the color of a jade reaches green, it is regarded as a high-grade product. On the other hand, turquoise is mainly concentrated in filamentous and flaky aggregates, which are usually surrounded by light, colorless or other alkaline regulators. When the colors of the basic regulators around the green jade can achieve a harmonious and contrasting relationship, the color quality is also regarded as excellent. Structure-very fine fiber interwoven structure is a necessary condition for jadeite, and jadeite with this structure is oily, fine and non-grainy; On the contrary, the particles are coarse and the structure is loose. Transparency-Emerald is a collection of many qualities, and transparency is extremely rare. The more transparent, the better. When a jade product has gorgeous colors and certain transparency, it is superior. Cleanliness refers to the degree to which jadeite contains other mineral inclusions and cracks. Natural jadeite can contain white and black massive minerals or mineral aggregates, which will affect the beautiful color and polishing quality. Cutting-for the surface of Yuhuan, it is required that the cutting should highlight the color, the cutting should be regular and the polishing should be excellent; For jade pendants and ornaments, craftsmen's ingenious conception skills will play a decisive role. Weight-there is no strict weight limit on the value of jade jewelry, but in the case of other similar factors, large size means large weight.