Black onyx also acts as a spiritual stone. This stone is responsible for activating the root chakra. Black onyx shows multiple benefits if meditated with this gemstone. This semi-precious black gemstone also helps to stay grounded in psychic work or in past-life exploration. Other than black onyx, there is a green onyx responsible for the unblocking of the heart chakra, and the white chakra unblocks the crown chakra. Overall, wearing a black onyx ring or jewelry will indirectly promote your personal and spiritual growth.