Field appraisal: Wulong River basin, a tributary of Qindun River in northern Myanmar, is a high-quality jadeite mine. There are hundreds of new and old mines (pits) within the scope. The terrain is hilly, the river valley is flat, the forest and grass are lush, the rainfall is abundant, the annual rainfall is more than 3000 mm, the quality is good, and the output is large. The new market mouth is highly valued by merchants. The stones produced in the deep are marked by red wax, black wax and white yellow wax shells. It should be pointed out that there are many jade yards, and each yard may be produced.
In addition, there are crack types such as size, opening and closing, which have great influence on evaluation, processing and utilization, and are a major defect of jadeite. Insiders said that they are not afraid of big cracks or small cracks, and would rather gamble than gamble. In gambling stone trading, we should pay attention to the outside of the big face, such as double face, big face, evil face and so on. However, the small side and the inner side are relatively weak, so we must be cautious. Experts pointed out through research that the damage degree can be judged by the color of the lock. White is a general rupture, and if it is red, yellow and black, it is a serious degree. These are the characteristics of open cracks, and those with no obvious color belong to micro-open or closed cracks. The internal cracks of finished products and Ming products (open-door jadeite) should be carefully observed, such as porcelain cracks and ponytail cracks, especially green cracks and dislocation cracks, which have a direct impact on their pricing and sales.
Counterfeiting and anti-counterfeiting have a long history in the transaction of jadeite raw stone and finished products, and there are various methods. Of course, today people are also using advanced identification technologies and methods to prevent counterfeiting. Gambling stone, as the original jadeite stone, has its particularity. Therefore, gambling stone fraud and counterfeiting are also very knowledgeable.
1. False chip opening: make a small hole on the colorless low-grade gambling stone with poor water head, and paste the high-quality chip to make it sub-optimal. When identifying, we should carefully check the adhesion marks around the opening (door), the influence of gap shape and temperature difference on it.
2. Fake leather shell: Glue inferior materials, waste stones and fakes with high-quality jade leather shells, and then bury them in the soil soaked in acid and alkali to make them look like "genuine leather" to cover up artificial traces. First, clean it with water, check every point and every surface of the shell, and don't let go of tiny holes, cracks and holes, and compare the changes of color and particle size.
3. pseudo color: Coloring and dyeing turn colorless and light-colored materials into bright turquoise, as well as waxing, painting and deep mud. During identification, the color of enamel turns red with a color filter, and the color distribution changes with a magnifying glass. Artificial coloring is heavier at tiny cracks, and other parts are lighter or colorless. Before observing the change, wash and heat it slightly.
4. False heart: Dig the heart to take out a part of high-grade jadeite, leave the high-grade jadeite on the skin, and then inject lead and other substances to seal the incision. If the weight is too heavy or too light, it may be fake. For the outer skin, you can use a chain and a knife to scratch whether there are uncertain soft objects and look for signs of sticking.
In the long-term practice of jade processing and production, the predecessors of China's jewelry industry have summarized a lot of experience about jade, and expressed these characteristics of jade in the form of concise aphorisms. Remembering these maxims and being able to understand and appreciate their profound connotations will benefit you for life.