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

A combination of Okinawa's popular glow-in-the-dark firefly glass and terahertz technology. ■Size: 18 beads, diameter 12mm (±0.5mm), inner diameter 180mm (±5mm) ■Size: 20 beads, diameter 12mm (±0.5mm), inner diameter 200mm (±5mm) *The photo shows 16 beads. Firefly glass is luminous (phosphorescent) and glows in the dark. Artisans melt each piece of colored glass and roll it around an iron core. The molten glass, like starch syrup, is then layered with silver foil using a special technique to achieve beautiful colors. Terahertz waves emit terahertz waves, vibrating approximately one trillion times per second.