BLACK ONYX (The Stone of Self Mastery and Self-Control) enhances steadfastness and determination setting one's mind to a task. It is a good stone to have around during times of mental or physical stress or bereavement, as it provides strength and support during difficult circumstances. It is a soothing stone said to help alleviate fears and worries and to help you to feel comfortable within yourself and in your surroundings. When worn, it will defend against negativity that is directed at you. A good moving on stone.