The naturally formed grain is caused by the change of composition and structure of white jade. White jade is mainly composed of silicate minerals, which may change under the influence of pressure, temperature and chemical composition during its formation. These changes can form patterns of white bracelets, such as moire, running water, stripes and so on.

If the shape and arrangement of lines are too neat or obviously repetitive, it may be artificially processed or treated. If there are too many spots of the same color or repeated colors on the surface of the jade bracelet, it may also be dyed or chemically treated.

As for the value of this white bracelet, we need to analyze its grain, appearance, texture and other factors in detail. If the bracelet is natural in texture, intact in appearance and excellent in texture, the value may be higher. However, if the grain is artificially made, or the bracelet has obvious flaws and defects, then the value may be lower. It is recommended to find a professional jewelry appraiser or jade appraisal institution for evaluation.