Protection, shielding, grounding, transformation, strengthening. Onyx is a stone that provides support during difficult times or times during extreme physical or emotional stress. It is a facilitator to mastering your own destiny. It is a stone that promotes vigour, steadfastness, and stamina. It helps with self-confidence and balances your yin and yang energies. It is a stone that is beneficial for teeth, bones, improving cell regeneration, bone marrow, fingernails, skin, hair, and blood disorders.