Glow-in-the-dark Firefly Dangle Charm 14k gold plating Metal Silver Gold Light up your look with the Glow-in-the-dark Firefly Dangle Charm. This 14k gold-plated firefly charm features rounded glow-in-the-dark glass – white in the daylight and milky green at night – which recharges when exposed to sunlight or UV light. A second 14k gold-plated disc reads 'You light up my life.' This engraved charm makes the perfect gift for the one you love, or a stylish statement of self-love to remind you of the light you carry within.