Stone rooting in the earth, it helps in the treatment of dysfunctions of the root chakra. It anchors fickle people in a more stable way of life and helps in self-control, self control. ... Black onyx helps to purify the karmic energies inherited at birth. The curative virtues of Onyx act directly on certain organs. It aids in the sanitation of the liver and kidneys for a healthier and healthier body. It is also a stone that can be used to regulate the level of cholesterol.