Obsidian is a very healing, a very protective stone, good for removing negativity, and for protection against psychic attacks. Obsidian protects the gentle. It is said to benefit the stomach, intestines, muscle tissue, and can rid one of bacterial or viral infections. It sharpens and focuses internal and external vision. This ring is solid sterling silver All Hand Made, Solid Back very Hefty with Excellent Polished Finish and has a very Solid Feel and Weight to it. It measures about 7/16 inch (11mm) in Width. Available from, sizes 9-13.