Obsidian is one of those stones people associate as having a lot of positive metaphysical qualities. Classified as a protective stone, it is believed to shield its wearer from negativity, blocking psychic attacks and absorbing negativity, which comes in from the environment. Apparently, it also relieves one of mental tension and stress. If you tend to believe in these things, then you may prefer buying an obsidian studded ring over, say, a black ring with diamonds. Following are some qualities it arguably has, a which a jewelry diamond does not.