Onyx, as expected due to its colors, is also a stone for protection. It can be worn to still sexual desires. Onyx is associated primarily with the root chakra.
It assists with challenges in life, especially those caused by a drain of energy. It also helps with grounding and controlling or eliminating excess or unwanted energies. Black onyx and red onyx are associated with the base chakra. Black onyx is associated with linking the base and crown chakras thereby balancing energy throughout the entire chakra system.
Onyx is a grounding stone, helping to center and align, encouraging happiness and good fortune.