The Black Agate gemstoneis said to be associated with the planet Saturn, and it is the birthstone for Leo, the zodiac sign. It is a soothing stone and is good for wearing, especially during times of emotional turmoil. It is known to help release negativity, as well as to guard the wearer against the 'evil eye'. Crystal healing is an alternative medical technique in which crystals and other stones are used to cure ailments and protect against disease. The use of crystals in such environments may help induce relaxation, although this effect is also not backed by scientific evidence. A powerful protection stone, Black Onyx absorbs and transforms negative energy, and helps to prevent the drain of personal energy. Black Onyx aids the development of emotional and physical strength and stamina, especially when support is needed during times of stress, confusion & grief.