Rainbow Obsidian Hearts, Obsidian is a lustrous, volcanic glass. Metaphysical Beliefs, All Obsidian, Reflects ones flaws and presents clear picture of necessary changes and is grounding and protective. Rainbow, Is known as a stone of pleasure that brings gratification and enjoyment to ones life, allows recognition of ones spiritual nature, good for gazing, especially regarding matters of love, relationships, and total development of ones etheric and physical forms. Rainbow Obsidian is associated with the Root Chakra. Astrological Sign is Libra. Number Vibration is 2.