Tetrahedron is hand carved in meditation. Its a powerful sacred form for directing energy, core strengthening, and protection. Its open design allows for directing powerful high frequency energy through the form and directing energy from the stone set in it. This brilliant stone is an 8mm round Brazilian Angel Amethyst with perfect facets. Amethyst is used for high frequency spiritual healing. Amethyst is used more than any otherfor spiritual connection and guidance all around the world. This a powerful combination of strength and guidance.