It is impossible to determine whether the tourmaline of Tik Tok's jewelry is true. However, you can identify the authenticity of tourmaline by some methods.

1. Check the color of tourmaline. Tourmaline is rich in color, but it is not dull, but dynamic. If tourmaline is exaggerated in color and looks unnatural, it may be a fake.

2. Check the processing of tourmaline. The cutting surface of real tourmaline is usually spherical and the facets are angular. If the tourmaline cutting surface is flat and the facets are smooth, it may be a fake.

3. Check the inside of tourmaline. Tourmaline often contains some gas-liquid inclusions, which are often arc-shaped. If tourmaline doesn't have these features inside, it may be a fake.

4. Use thermal test. If tourmaline is placed in a high temperature environment, if the color of tourmaline fades quickly and can be recovered after cooling, it may be genuine. If the color of tourmaline cannot be recovered, or it takes a long time to recover, it may be a fake.

The above methods can help you identify the authenticity of tourmaline, but they cannot guarantee the accuracy of 100%. If you are in doubt about the authenticity of tourmaline, it is recommended to consult a professional jewelry appraiser.