Glow-in-the-dark necklaces are fun accessories that emit a soft light in the dark. They are typically made from materials that absorb light during the day and release it slowly when the lights go out. These necklaces come in various shapes and colors, making them popular for parties, festivals, and nighttime events. To activate the glow, simply expose the necklace to a light source for a few minutes. The glow can last for several hours, depending on the quality of the materials used. Many people enjoy wearing glow-in-the-dark jewelry for its playful and eye-catching effect, especially during Halloween or other celebrations.