To answer your question:

1

The produced tourmaline is also priced. My aunt has two chains. One is 18, and the other is 38. The price depends on how many elements are extracted from it. The so-called standard should exist, but it has not been standardized. They are all products. The product says so much.

2

There are no side effects, and the soaking effect is not very great. It is best to use a bed with infrared rays, which can emit a lot of energy and feel more obvious.

I didn't put it on my gums when I had a toothache. After a while, it did relieve the pain, but it was a lie to say that it didn't hurt at all.

The above is the effect of my own use of tourmaline, I hope I can help you.