This is one of our products from Brazil. The rough Black Tourmaline columns are mounted on a custom wood base. Tourmaline is distinguished by its 3 sided prisms unique in the mineral world. Black tourmaline is useful for promoting groundedness and warding off negative energy. The small size is approximately 4 inches tall. Cost runs from $3.00 to $9.00 for the small. Medium size is approximately 5 inches tall. Cost runs from $10 to $15. There is also a large tourmaline pieces on wood base featured separately.