It is not uncommon for the pink crystal on the tourmaline crystal bracelet to fade, but the specific situation needs specific analysis. The following are some reasons that may cause the tourmaline crystal bracelet to fade:

1. Oxidation: Tourmaline is a mineral and is easily affected by oxidation. If the bracelet is exposed to the air for a long time, or often comes into contact with chemicals, it may lead to the oxidation of the crystal surface, thus fading.

2. Improper heat treatment: tourmaline crystals usually need heat treatment to improve their transparency and color. If the heat treatment is improper, the internal structure of the crystal may be unstable and easy to fade.

3. Overillumination: Sunlight may also cause the surface of tourmaline crystal to fade.

If the color fading of the merchant's bracelet is one of the above reasons, then this may be normal. However, if the color of the bracelet is caused by manufacturing quality problems or the merchants use unqualified materials, then this is not normal.

I suggest you check the material and manufacturing process of the bracelet first, and consult professional jewelry appraisal institutions or consumer rights protection organizations to understand relevant laws, regulations and rights protection channels.