Onyx is a stone of inner strength, focused attention, willpower, self-mastery, discipline, and reason. It is great for all those whose work calls for high levels of focus, perseverance, and discipline. It has a grounding influence that filters excessive energies, soothes hot tempers and calms anxiety. Onyx is also a stone of physical strength and assists in gradually building up one’s vitality. This adds an element of protection to the nature of onyx.