Item Name: Black Obsidian Gua Sha Face Lifters. Material: This Gua Sha is made from Natural Black Onyx Stone. Use/Benefit: It Smoothes Fine Line and Wrinkle. Contour and Refine Face. It Remove Blockage. It will give you Natural Glow and Youthful Skin. About Product: Crystals are thought to add an extra element of healing to the treatment by helping to release emotional, mental, or spiritual blocks. Crystals may be placed on or around your body or you may be asked to hold a crystal.