The trachoma of jadeite is also called "flying wing". Jade generally has this feature, which is the original grain structure of jade, and jade is formed by sand particles at high temperature and high pressure. The reflective surface formed by this structure is called trachoma, and trachoma will also appear when carving. Inferior jadeite is more likely to suffer from trachoma.

Generally, in the process of carving, the grinding head with emery will crack the particles on the surface of jadeite through friction, making the particles bigger. This large particle is called trachoma. Emerald with trachoma will affect the appearance. After the carving is completed, we can finely polish the surface layer and then polish it, which can eliminate some trachoma.

No matter whether the quality of jadeite is good or poor, there will be trachoma. If it is primary trachoma, it does not affect its own value. If there are pits on the surface of jadeite due to poor polishing process, the price of jadeite will be relatively low.

Extended data:

Cleaning and maintenance

1. If the surface becomes dirty due to long-term wear, clean it with clear water, and then gently sweep the jade with a horsetail bristle brush. In this way, it is difficult for corrosive substances to exist on the surface of jadeite for a long time and cause damage to it.

2, remember, when taking a bath or exercising, it is best to remove the jade. Because shower gel or sweat is a corrosive substance containing acid and alkali, if you stay in this environment for a long time, it is easy to lose luster.

3. Usually, jadeite can be wetted and maintained with a small amount of white tea oil after cleaning. It can not only lock the water loss of jadeite, but also improve the luster and moisture of jadeite.

Baidu Encyclopedia-Emerald (Stone Jade Polycrystalline Aggregate)