Thank you for viewing! (^-^) This is Ryukyu Hotaru Glass, carefully crafted by artisans with silver foil inlay. It's a glow-in-the-dark type, absorbing sunlight during the day and glowing in the dark☆ Bead size: Approximately 7mm Chain: Nickel-free silver, 36+5cm Discounts available for multiple purchases☆ This is handmade. I make each piece with care, but it's not comparable to mass-produced items. Please handle it gently. As it uses natural stones, there may be cracks or inclusions. I have several cats. Please refrain from purchasing if you are concerned. ・I am studying to polish natural gemstones like Larimar. My polishing skills are still developing, but I appreciate your understanding (*´ー｀*) Please read my profile for more information☆彡