Hardbody porcelin and Travertine actually. Score and snap, 1/16" grout joints.The grinder should be for cutting out things that will get covered, like a heating grate or the shower valve eschution.
Nobody is cutting porcelain or ceramic with a grinder that looks as good as cut with a wet saw. That picture posted is limestone which don't count. :whistling
Wet saws give me pneumonia. :sad:
The majority of the shower valve cut out was done from the back.