Carefully observe the sand (turning sand) on the weathered crust of jadeite original stone, and feel its texture by hand. If the sand is upright, evenly distributed, hard and rough, it is old jade. On the other hand, if the sand grains are not prominent enough, unevenly distributed, soft in texture and easy to fall off, then this is tender jade.

2. Water splashing auxiliary method

Splash a small amount of water on the original jade shell. If the water penetrates into the shell quickly (the wet shell will dry soon), then this is a tender jade; On the other hand, if the seepage velocity of water is slow (wet skin dries slowly), it is old jade. Its principle is mainly due to the different structural compactness of old and young jadeites.

The structure of old jadeite is very dense, the spacing between crystals is very small, and water is not easy to penetrate into jadeite. Most water molecules can only stay on the surface of jadeite and disappear slowly, so it takes a long time to dry after sprinkling water on the surface of jadeite. However, the structure of young jadeite is relatively loose, and the gap between single crystals is wide, so water easily penetrates into jadeite, leaving fewer and fewer water molecules on the surface of jadeite, so it is observed that the wet jadeite surface dries quickly.

3. Method of observing fog layer

Observe the fog layer near the weathered crust of jadeite original stone at the jadeite incision. If the fog layer is thin (about one finger wide or narrower), it is the original jade stone. If the fog layer is thick (more than two fingers wide), then this is a young jadeite stone.

In a word, the above methods for judging the quality of jadeite products, rough stones and rough stones are simple and easy, which have high reference significance in the actual jadeite trading and are a summary of the experience in the field of jadeite trading for centuries.

However, the germplasm characteristics of jadeite are ever-changing, and any method can't cover everything, so it is inevitable to generalize. In practice, we should use it flexibly, adopt a variety of different methods at the same time, and make the most comprehensive, objective and reliable judgment with rich personal practice.

Extended data

The quality evaluation system of a jadeite consists of six elements: variety, color, technology, shape (appearance), cracks and defects, size and weight. Among them, the "species" of jade is the most important. There is a jargon among experts who play with jade-laymen look at colors, while experts look at seed materials. The species of jadeite can be simply divided into seven grades from superior to inferior: old pit glass species-glass species-ice species-hibiscus species-green species on white background-common bean species-taro species.

Generally speaking, good jadeite has high transparency because of fine particles, while poor jadeite has low transparency. But this is not a simple correspondence. Often consumers feel good when they see jadeite with high transparency, and feel poor when they see jadeite with poor transparency. This is one-sided, but there is no essential understanding of species. Some experts prefer to use old species and new species to express the difference between good and bad species.

The concept of species is not directly related to color, but color is easy to misjudge species. Thick black color often affects transparency, while colorless and white people can easily see its transparency. Consumers often encounter colorless glass and ice jadeite, and they are full of praise, but they are skeptical about jadeite with full color and good variety. Visible colors can confuse the observation and judgment of species.

"Species" is a prerequisite for high-grade jadeite, and the jargon also says "one, two colors, three processes" and "low-grade colors, high-grade species". Bean seed jadeite is the most common jadeite variety. The so-called "ten jade and nine beans" refers to the universality of bean seeds. Its structure is loose, the mineral particles are coarse and obvious, the texture is rough and the fineness is poor.

Bean seed is the most common jadeite variety and the main source of raw materials for middle and low grade jadeite pieces. However, due to new bean seeds and light, jade pieces are easy to deteriorate or crack after many years. Bean seeds have bright colors, uniform brightness, high shipment, relatively cheap raw materials and cheaper finished products, which have certain competitiveness.

References:

Mobile phone phoenix network-share the identification method of judging the old and tender species of jadeite original stone gambling stone with leather shell