How to see the value of Lantian jade bracelet?

Although lantian jade is not the most precious variety, it is one of the earliest jade species developed and utilized in China, with a history of more than 4,000 years. During the Warring States Period, Qin set Lantian County, which was named Lantian because the beauty of jade was blue and the county produced beautiful jade. Lantian jade is colorful, mostly green, so it is commonly called "Cai Yu". Its color is like the tender leaves of Chinese cabbage, but some people have ivory, green, yellow and red, which is called serpentine marble in mineralogy. The water identification method of jadeite authenticity will drop a drop of water on jadeite, and if it is dewdrop-shaped, it is real jade; The water droplets disappear quickly, which is a fake. Touch it with your hands. If it is real jade, it will feel cold and lubricated. In the inspection method, jade objects face bright places, such as sunlight and lights. If the color is clear and the green is evenly distributed, it is a real jade. The tongue licking method has a astringent feeling on the tip of the tongue; Fake jade has no astringency. Magnifier Watch the purchased jadeite under the magnifying glass, mainly to see if there are cracks. The jade without cracks is the best quality, followed by cracks. Even if it is real jade, the value of cracks is greatly reduced. The more cracks, the more obvious and the lower the value. Lantian jade is a famous jade in ancient times. As early as the Qin dynasty, it was mined to make a jade seal, and there was a famous jade. There are records of beautiful jade produced in Lantian in many ancient books before Tang Dynasty. According to records, Emperor Tang Ming ordered lantian jade to make percussion instruments for Yang Guifei. His "History of Han Geography" said that beautiful jade was produced in "Lantian Mountain in the north of Beijing (north of Jin 'an)". Later, some ancient books appeared, such as Biography of consorts in the Later Han Dynasty, Zhang Heng's Poems on Xijing, Guangya, Zhu, Yuanhe County Records and so on. During the Wanli period of the Ming Dynasty, Song said in "Heavenly Creations": "The so-called Lantian is the alias of jade in Qingling (Kunlun Mountain), which was later mistaken for Lantian in An." The new lantian jade mine mined by modern people is located in Yuchuan and Hongxing, Lantian County, about 35 kilometers away from the county seat. The ore-bearing strata are Archean biotite schist and amphibole gneiss. Jade is fine-grained marble, mainly composed of calcite. Jade can be divided into five types according to mineral composition and appearance characteristics: the first type is white marble. The second is light beige serpentine marble. The third is yellow serpentine marble. The fourth kind is apple serpentine marble. The fifth category is banded tremolite serpentine marble. Chemical composition According to the research, the untreated new lantian jade rough stone contains 23.86% of silica, 0.010% of titania, 0.55% of alumina, 0.0004% of chromic oxide, 0.38% of ferric oxide, 0.55% of ferrous oxide, 0.0 15% of manganese oxide and 0.5% of magnesium oxide. It is blocky, banded and spotted, with dense, delicate and tough texture. The hardness is 3-4, and the density is about 2.7 g/cm3. Some varieties foam in the presence of hydrochloric acid. Quality Requirements and Identification of Arts and Crafts Requirements lantian jade has bright or elegant color, strong luster and high transparency, and serpentine and other minerals are evenly distributed. The texture is dense, delicate, tough and smooth, without cracks and other defects. The block size is very large. Lantian jade —— Classification lantian jade has jadeite, jet, colorful jade, white marble and topaz, most of which are colorful jade, with distinct colors, good color and peculiar patterns. According to the recent survey, lantian jade's reserves exceed 6,543,800 cubic meters, mainly distributed in Yuchuan Township and Hong Men Temple Township. In the past, local folk jade craftsmen used to collect jade by hand, but in recent years, they began to use mechanical quarrying to make various decorations and handicrafts. Such as jade cup, jade inkstone, jade bracelet, fitness ball, etc. Many jade products show natural landscape images, which are inexpensive handicrafts. Lantian jade-Application Value lantian jade and lantian jade have been widely used to make jade pillows, followed by bowls, cups, wine sets, stationery, fitness balls and bracelets. Jade similar to lantian jade is widely used in carving figures, animals, flowers, cauldrons, vases, ashtrays, Yin He and other works of art or practical products all over the country. Because of its large size, there are many large jade articles made with it. Lantian jade has been regarded as a treasure by royal families and dignitaries. Qin Shihuang took lantian jade as the seal, and Yang Guifei's jade belt was also lantian jade. Legend has it that the token of love that Li Longji gave to Yang Yuhuan was lantian jade. Because its texture is like the tearing of ice, people later named it after Yang Yuhuan's nickname Furong, also known as "Ice Furong Jade". Water hibiscus, fresh and bright, symbolizes beautiful love, especially suitable for young people and fair-skinned people. Because it is located in the spring eye and receives a lot of hot spring water, there are not many soluble minerals. Soaking in water to wash your face has a good maintenance effect on your skin, which can sterilize, diminish inflammation and whiten your skin. Is the only kind of beautiful jade, the biggest feature is that it changes color quickly, so it is favored by the majority of girls! Jade articles made in lantian jade are crystal clear and full of charm, and some are like pines and cypresses, flowing like clouds; Some are like a hundred fish play; Some are like blooming peonies, chrysanthemums and tall and straight bamboos; Some are like pandas eating bamboo and roaring in the valley; Danhe flies, and birds fly towards the phoenix; There is heavy splash of ink; Some are as white as fat; Some are green as jade; Some are as yellow as gold. These products, which combine reality with reality and have different expressions, add infinite interest to natural beauty and are favored by consumers at home and abroad. Its products are sold all over the country and exported to Europe and America. Lantian jade and its handicrafts have become the pillar products of Shaanxi, enjoying high reputation at home and abroad. Efficacy lantian jade's physical test shows that it contains many trace elements beneficial to human body, such as calcium, iron, potassium, sodium, manganese and copper. Has the functions of relaxing muscles and tendons, activating collaterals, promoting blood circulation and caring skin. Lantian jade is regarded as a kind of health jade. Wearing jade often can make the trace elements contained in jade inhale into human body through skin, thus balancing the imbalance between yin and yang and qi and blood, making people get rid of diseases, protect health and prolong life. Lantian jade-lantian jade identified lantian jade, Shaanxi Province as one of the earliest historical jade articles in China. Lantian jade stone mine in Shaanxi Province is located in the marble belt of Mesoproterozoic Kuanping rock group, which was formed by the interaction of regional metamorphism and contact metasomatism. The gemological characteristics of lantian jade in Shaanxi Province were systematically studied by modern testing methods, and the advantages of history, resources, geographical location and human resources of lantian jade in Shaanxi Province were analyzed and discussed, so as to clarify its potential social and economic value. The logo is explained as follows: 1. Characteristics under polarizing microscope: lantian jade, Shaanxi Province is serpentine marble, calcite is mainly granular texture, diorite is mainly cryptocrystalline texture and scale metamorphic texture; Cryptocrystalline texture formed by serpentine metasomatism marble can also be seen, and minerals with well-preserved crystal forms such as diopside, olivine and a small amount of muscovite can also be seen. Lantian jade bracelet 2. The results of EPMA show that the chemical composition of lantian jade in Shaanxi is very close to the theoretical values of calcite and sphalerite. The high-content components are oxides of silicon, magnesium and calcium, while the low-content components are mainly oxides of iron and aluminum, followed by oxides of potassium, sodium, manganese, titanium and chromium, among which the iron content of marmatite is relatively high. 3. The results of X-ray powder diffraction test show that the transparent yellow and green parts in lantian jade, Shaanxi Province are mainly composed of diorite, with a small amount of calcite and dolomite, which are similar to those in xiuyan jade, Liaoning Province, showing the characteristic spectrum of diorite. 4. The infrared absorption spectrum shows that the main mineral components of the transparent yellow and green parts in lantian jade, Shaanxi Province are not only sphalerite, but also a little translucent.