Material: Fluorite 9.5x10mm Origin: USA Size: Approximately 9.5x10mm (±0.5mm) Wrist size: Approximately 16cm (elastic) Weight: Approximately 20g Features and Meaning: This adorable heart shape is also recommended for use as handmade parts! Fluorite is called "Hotaru-ishi" (蛍石, meaning "firefly stone") in Japanese. It has the property of emitting light when heated or exposed to ultraviolet light, and it is named after this property. Because this phenomenon of emitting light was first discovered in fluorite, the phenomenon of fluorescence came to be called "fluorescence." The English name "fluorite" comes from the Latin word "fluere," which means "to flow." Fluorite has a variety of transparent colors such as purple, blue, green, yellow, pink, and colorless, and is a fantastic stone. Some stones have multiple colors, called "rainbow fluorite." Item No. BG6084