Blue onyx is associated with calmness, soothing energy, and inner peace. It's believed to promote feelings of tranquility and relaxation, helping to reduce stress and anxiety. Blue onyx is also associated with communication, particularly in expressing oneself with clarity and confidence. It's thought to enhance mental focus and concentration, making it useful for meditation and spiritual practices. Additionally, blue onyx is believed to stimulate intuition and deepen one's connection with their inner wisdom.