These earrings feature 10mm firefly glass. Color: Kerama Marine These cute earrings feature Kerama Marine firefly glass, which is inspired by the beauty of the sea surrounding the Kerama Islands, located west of Okinawa. The glass dangles and sways from a chain. ※ This firefly glass is glow-in-the-dark, so it will glow in the dark for a while when exposed to strong light. ※ About Firefly Glass A popular souvenir item in Okinawa, firefly glass, with its deep blue color reminiscent of the Okinawan sea, is a glass bead with a hole, made using a molding technique called burner work, similar to tonbo-dama (glass beads). Artisans melt colored glass one by one and shape it around an iron core. They then layer silver foil onto the molten glass, like syrup, and use a special technique to create beautiful colors. There are no clear records of when firefly glass, a type of tonbo-dama that originated outside of Okinawa, became popular as a souvenir in Okinawa. However, it gained attention in the late 1980s as a replacement for rare coral products, and it is said that its color, reminiscent of the deep sea, captured the hearts of tourists. ・The earring posts are fish hooks (gold color, brass). ※ You can also have silver-colored hardware (chain also silver, brass) at no additional charge. ※ You can change the earring posts for a fee. ・Titanium hooks: +10 yen ・Piercing posts: +40 yen (can be changed to silver) ・Resin hooks: +15 yen ・Resin posts: +145 yen (can be changed to silver) ・Non-hole earrings: +205 yen (can be changed to silver) ・Earrings: +85 yen (can be changed to silver) If you change the hardware to silver, the chain will also be made in silver. If you wish to make any changes, please let us know in the comments section. We will create a dedicated page for you to make your purchase. ・These are handmade, so they are not perfect. Please purchase only if you understand. ・The price and sale are for a set of 2. We do not sell single earrings. ・If you purchase other items I am selling together, we can discount the shipping cost for the duplicated amount, but we do not offer discounts on single items. ・I do not smoke, and I do not have any pets.