Inclusion: Kunlun Moyu is a natural ore, which may contain some internal minerals or impurities. These inclusions may form black spots in jet.
2. Cremation cracks: In the petrochemical process of Kunlun Moyu, cracks usually appear, and tiny cracks in the cracks may absorb some pollutants, leading to the formation of black spots.
3. Stone defects: Some Kunlun moyu may have some stone defects, which may be exposed during cutting and polishing to form black spots.
4. Exogenous pollutants: If Kunlun Moyu is exposed to air or other impurities during production and processing, pollutants may adhere to the surface of Moyu and form black spots.
In a word, the black spots of Kunlun Moyu bracelet may be caused by inclusions, cracks, stone defects or external pollutants. For Kunlun Moyu jewelry, it is recommended to choose works with good quality and no obvious stone defects and pollutants.