Brand New! Obsidian Gua Sha Perfected throughout the centuries, black obsidian gua sha was built to have a firming, lifting effect on the skin. Unlike other stones, black obsidian naturally retains warmth and is great to use on congested, blemish-prone skin. This makes black obsidian the ideal stone for your Gua Sha facial massage especially in combination with the right facial care! On an energetic level, the stone is best known for its anti-anxiety effect.