Obsidian is an excellent ally for those who are going through a dark night of the soul. Extremely protective, Obsidian assists in shadow work and deep healing. Each stone is shaped with a smooth divot to rub your thumb over too soothe an overactive mind. Some stones have the engraving over this divot, and but most have the engraving on the back. (After polling my customers, half preferred to feel the texture on the stone and half preferred the smooth stone). Measurements: ~2” x 1.5” x .25”