Jade selection and valuation principles
The superior quality jadeite is called jade, color, transparency, uniformity, shape and knocking are the methods for ordinary people to view or evaluate jade, and the jade is divided into: glass, dark old pit, old pit, gold wire, oil clear , bean green, flower green, melon green, etc. Among them, the jadeite of the glass type is the top grade, and the "water" is particularly high and the transparency is also called "ice species". It can be said to be a treasure in the "glass type". Most consumers who buy jade bracelets may have the experience that the merchant will knock the jade bracelet on your face and listen to whether the sound is crisp and turbid, and it is better to have a crisp and melodious voice. This is to prove that the crystal of jade is tight and has no cracks.
1. Emerald Green: The more green, the more valuable.
2. Transparency: The internal crystal structure of jadeite is tight and the transparency is also high. The “glass type†we refer to is the jadeite with high transparency. For example, because jade itself is rich in chromium, it forms ice jade, value. It is not expensive and hard to find.
3. Color uniform: In addition to the color green, high transparency, it must be uniform color is the top grade.
4. ç‘•ç–µ: Pay attention to the presence or absence of cracks, spots, etc. These flaws will affect the quality of jadeite.
5. Shape: Most of the jade ring faces are oval egg-shaped, as for other shapes, there are many shapes, and the shape and quality of the jade are also affected.
6. Engraving: The quality of the carvings and the symbolic meaning of the carvings have an impact on the price.
7. Size, thickness: The jade of the same quality is of course higher at a larger and thicker price.
8. Gloss: In addition to the above conditions, the gloss should be sharp and not dark. To sum up the above points, please buy a jade friend must look at more comparisons, buy a jade is to comprehensively compare her characteristics to assess her value.
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The ceramic phase in the cermet is an oxide or refractory compound with a high melting point and a high hardness. The metal phase is mainly a transition element (iron, cobalt, nickel, chromium, tungsten, molybdenum, etc.) and its alloy. Cermets have both metal toughness, high thermal conductivity and good thermal stability, but also has a ceramic high temperature, corrosion resistance and wear characteristics.
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