Obsidian is truth-enhancing.  A strongly protective stone, it forms a shield against negativity.  It blocks psychic attack and absorbs negative energies from the environment.  Obsidian draws out mental stress and tension.  It stimulates growth on all levels, urging exploration of the unknown and opening new horizons.  Brings clarity to the mind and clears confusion.  Helps you to know who you truly are.  Obsidian dissolves emotional blockages and ancient traumas.  Promotes qualities of compassion and strength. Obsidian aids the digestion and detoxifies.  It reduces arthritis pain, joint problems and cramps.  Warms the extremities. This Mushroom shaped piece of Black Obsidian measures 2cm x 1.5cm approx and is suspended from an 18 Inch 925 Silver chain. Obsidian is a birthstone for Sagittarians. Obsidian is usually black but can also be green, brown, or beige. When obsidian contains inclusions or other elements, it can be orange, yellow, blue and red.