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This is a gua sha I bought a long time ago and have been using.
I mainly use the gua sha to rub my jaw area when my face is swollen after applying cream. Since my job involves working in front of a computer, my neck and shoulders get very stiff, so I use it on my neck then as well. I remember getting a bruise on my stomach the first time I bought it because I rubbed it so hard to burn fat.
So from then on, I don't rub hard but with moderate force, but the downside is that since it's ceramic, it's a bit heavy and I have to be careful in case it breaks.