Mahogany obsidian tumbled stone 3/4 cm Mahogany obsidian is a natural stone with powerful properties, ideal for protection and grounding. This 3/4 cm tumbled stone is perfect for balancing energies and providing a sense of stability. The virtues of mahogany obsidian in tumbled stone: protection against negative energies enhancement of grounding to the earth stimulation of inner strength emotional balance associated astrological sign: Scorpio Mahogany obsidian is particularly beneficial for those born under the sign of Scorpio, providing them with protection and inner strength to face life's challenges.