These are BLACK onyx stones, used in flower pots to hide soil. Beautiful linings make unique attractive figures over the stones. These stones are popularly used in Bonsai. After decoration with these stones, the plant looks awesome. Colour of stones is permanent and it will not fade. These stones are also used in fish aquariums. Additionally, these stones are also used in making projects of children and various craft activities. Moreover, the stones are used in Feng Shui, Reiki healing therapy.