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Generally speaking, it is normal for jadeite to change color. Ordinary jade, or real jade, if you look closely, you can see that there are tiny pores on it, just like human skin. It needs breathing. Unless it is very high-quality jade, there are impurities to some extent. After wearing jade for a long time, it will absorb your aura and then expel those impurities from your pores. The longer the jade belt is, the less impurities it has, and the more it can have feelings with you and protect you. There are several color changes of jadeite: the first is that jadeite oxidizes in the air. Jade will be weathered when exposed to air, and the main change is oxidation. The weathering or discoloration of jade in the air depends on the fineness of the material. Hard and delicate jade materials produce little or no weathering, while loose texture causes great changes. Moreover, the process of oxidation and discoloration of jade in air is very slow. This color often appears on some white jade and sapphire products. Second, jade articles change color in tombs. Ancient jade unearthed in ancient tombs often changes in color. The reason for the change is the chemical composition contained in the funerary objects in the tombs or the erosion of the chemical composition in the soil, which is called Qin color. The third is hand rubbing. After a certain period of manual polishing or long-term contact with the human body, the surface luster of jade products will be more moist. Especially some buried ancient jade, the color will change after rubbing. The red color of some jade is gradually transformed into mature red after being soaked in soil and rubbed by plates, and some are bloodshot, so there is a saying that jade can suck blood. The fourth is artificial dyeing, so I won't go into details. Everyone has heard of it, but in the past, jade dyeing was the main means to make antiques old. Can be distinguished. Wear it for a long time and it will change color.