Here's what I mean by a Schluter Edge.
Schluter is a brand name and Schluter makes some really great metal trims for bridging the gap left when abutting materials are of differing depths.
Here it is from a little closer.
Now, A Schluter Edge isn't the only way to end a tile backsplash. In the trade, mosaic tile manufacturers makes something that's usually called pencil, or pencil edging. Here's some pencil edging at work.
The back splash material here is a blend of travertine and marble and the pencil edge is travertine.
Make sense? Cool.
Now, most sheeted, offset mosaics come looking like this:
The ragged edges interlock and hide the seams between sheets. This works great until you want to either finish an edge cleanly or change the orientation of the pattern to a vertical one. Setting a sheet like this vertically entails cutting off its ragged edges and automatically wasting a lot of the material. I say that's a small price to pay for an effect like this:
Here's a closer shot of that same backsplash tile.
It's a personal preference that makes tile setters hate me, but little things like this are what make a kitchen looked designed and not just installed.