carvings and pressure tools

Tourmaline is a group of gem species. It comes in a wide variety of colors. The best known varieties of tourmaline are green tourmaline, pink or red tourmaline, and blue tourmaline.

Tourmaline is a group of gem species. It comes in a wide variety of colors. The best known varieties of tourmaline are green tourmaline, pink or red tourmaline, and blue tourmaline.

Diànqì shí is tourmaline in Chinese.

i only know that it puts fluoride in the water