These look real and don't have the weight of stone or faux stone.  You don't need to leave such a large gap between the tiles and you can cut them easily with a diamond saw blade to mix up the pattern.  Gray delorean grout blends in perfectly (non-sanded for narrow grout lines).  Actually came here to order more for around my fireplace.  these are $20 cheaper than HD for the exact same thing with a different name.