1, only natural A-goods jadeite will be marked: commonly known as "A-goods". If the words "optimization" or "treatment" are written, it means that it is not natural, and it may be B goods or C goods. It is best not to buy such jadeite.

2. According to the national standard of jewelry and jade, the best product of jadeite is jadeite which has undergone acid leaching, bleaching and waxing during processing. According to the strength of acid leaching bleaching, it can also be divided into strong corrosion and weak corrosion. The jadeite with strong corrosion optimization is equivalent to the glue-free B goods on the market. Its interior has been seriously damaged.

3. The jadeite raw materials that can be used to make jadeite B goods are generally jadeite with more impurities and loose structure. After being soaked and corroded by strong acid and alkali, some substances are brought in and brought out, and corrosion is formed on the surface and inside along the mineral crystal, resulting in internal communication cracks and surface system of canals, and the internal cracks are serrated tensile cracks.