Fairy Garden Glow in The Dark Glo Stones White Glows Aqua 100pcs Fairy Garden Designed for use in Fish Tanks, Pools, & Ponds. Can also be used for Fairy Gardens and Home Plant pots. These are about a nickel in diameter. These are off-white during the day, but when charged glow a color! These are non-toxic, however, use should be adult supervised. (Small pieces)