Black Onyx has been described as having attributes which influences a person. These include self control, decision-making, intuition, protection. It is widely believed that black onyx can change your habits are erratic, either when used with faith. It is about as one powerful protection stone as it absorbs negative energy of people to release mental stress and promote emotional well being. This particular piece has been reconstituted  by grinding the Black Onyx into a powder, then adding a binding agent, then dried. This makes slabs of Black Onyx which can then be used for knife handles. This piece has lots of veins, a wonderful sheen, and provides a nice contrast to the White Marble.