Shiny and polished stone in irregula piece, undrilled, 2-3 cm. Tumbled stones are small, rounded crystals. They are created by putting rough rocks in a machine called a rock tumbler. It tumbles the rocks until their edges and surfaces become smooth, shiny, and polished. Each spiritual healing stone has a specific colour and psychic vibration, emitting positive energy to attune and cleanse your aura. Note: Each stone is unique and no two stones will be exactly alike in regard to shape, size, colour, or pattern.