Pyrite: 
Boost energy levels and promote physical strength and vitality
Enhance mental clarity and aid in problem-solving
Work as a powerful protection stone that shields and protects from all types of bad vibrations and/or energy
Stimulate the mind and improve memory, making it easier to recall important information when needed
Relieve anxiety and frustration, and as a mirror to the self, reveal the causes behind these emotions and promote a search for solutions
 
Onyx:  
Onyx is a gemstone known for its strength, stamina, and durability, promoting self-control and decision-making. It's also believed to offer protection, particularly against negative energy and dark forces, and can help release negative emotions. Onyx is often associated with grounding, providing a sense of security and stability, and can be helpful for those dealing with grief or anxiety.  
 
Black Tourmaline:  
Black tourmaline is often associated with protection, grounding, and emotional balance. It's believed to absorb and transmute negative energy, acting as a shield against psychic attacks and promoting a sense of security. Black tourmaline is also thought to enhance emotional stability, reduce stress, and help with emotional healing.