help!!!!! i am installing a marble floor and shower inclosure. I want to know how you are supposed to butt the tiles together on the 4 inch lip when you first go in to the shower. can I cut the stone on a 45 degree angle or do I polish the ends of the stone. because you will see the edge. Or is there some secret that i dont know and if you do polish the edges seen /how do you polish them? With what kind tool?