Terahertz Stone x Luminous Firefly Glass Blue Bracelet 12mm Glows in the Dark Power Stone Inner Diameter 18cm [GOLD STONE] Approx.

A combination of firefly glass, popular in Okinawa for its glow-in-the-dark properties, and terahertz technology. ■Size: 12mm diameter (±0.5mm), 18 beads, inner diameter 180mm (±5mm) ■Size: 12mm diameter (±0.5mm), 20 beads, inner diameter 200mm (±5mm) *The photo shows 16 beads. Firefly glass is a luminous (phosphorescent) type that glows in the dark. Each piece is crafted by artisans who melt colored glass, roll it into a ball around an iron core, and then layer silver leaf onto the molten glass, which resembles syrup, using a special technique to create beautiful colors. Terahertz waves emit vibrations that occur approximately one trillion times per second. ◆Terahertz The secret to terahertz ore lies in the energy that causes molecular vibrations to occur one trillion times per second. Terahertz waves (tera/1 trillion hertz waves) emitted from terahertz ore are electromagnetic waves that fall between "light sources such as far-infrared rays" and "radio waves." These terahertz waves possess properties of both light and radio waves, with frequencies ranging from 1 trillion Hz to 100 trillion Hz and wavelengths from 3 μm to 1000 μm.