Buy unique collection of Black Obsidian Arrowheads Necklace at cheapest price. Black Obsidian Moon is a powerful cleanser of psychic smog created within your aura, and is a strong psychic protection stone. This stone has powerful metaphysical properties that will help to shield you against negativity. The energy of these stones may stimulate the gift of prophesy. The arrowhead is simply the sharp tip end of the arrow. This sharp stone tip was used to pierce the flesh of the animal being hunted, either killing or maiming it.