Angan Obsidian Gua Sha Details Gua Sha stone have been a popular tool for beauty rituals since the 7th century in Asia. Gua Sha helps to reduce puffiness, drains the lymphatic system, tightens pores and increases blood circulation. The Obsidian stone is known "The Stone Of Self-Acceptance" and helps you embrace all aspects of your physical and emotional self Due to natural formations in the stones, each tool will be unique. Reduce puffiness Drains the lymphatic system Tightens pores Increases blood circulation Brighter complexion Promotes skin rejuvenation