A gua sha is a massage stone to massage and relax the facial muscles. If you use it regularly, you exercise the muscles in the face and neck and, over time, swelling and lines in the face are reduced. The massage stone is made of rose quartz, which contains good minerals for the skin. It can be used with or without serum and has three different sides to adapt to the curves of the face.Use:A gua sha is a massage stone used to massage and relax the facial muscles. If you use it regularly, you exercise the muscles in the face and neck and over time, fine lines are reduced. It can be used with or without serum and has three different sides to adapt to the curves of the face. B&O Paris Gua Sha