The Natural Black Obsidian Crystal Sphere is a necessary addition to all crystal collections. Obsidian protects against the fiery and agressive Yang energy that can be projected from others. Also, an effective stone for centering your own energy.
 
Each sphere is approximately 3 cm in diameter, making the hand-bag sized ball of energy easy to take with you. It also comes with a free wooden base, making it easy to display and enjoy its protective energy at home or in the workplace.