◇ Origin of Stone: Brazil ◇ Birthstone: October ◇ Inner Diameter: Free (using silicone rubber) <approx. 16.5cm> ◇ Tourmaline (Electric Stone) Beads: Approx. 7.9mm - 8.1mm (24 beads) ◇ Weight: Approx. 18.9g ◇ Tourmaline (Electric Stone) The negative ions generated by this stone purify air and water, and help to relieve fatigue, stress, and irritation. It also promotes metabolism and balances the body, and is attracting attention for its effectiveness in treating insomnia, headaches, and stiff shoulders. With various mineral inclusions, it comes in colors such as pink, green, red, blue, brown, and black, and is considered a particularly versatile power stone among power stones. *The color of the image may appear slightly different from the actual product. Please understand. *The item in the photo will be delivered.