gorgeous tile, however very hard to cut.  Had a very experienced tile installer install them and the color of the glass is actually just backing put on the tile.  If that backing comes off there is no longer color to the glass.  While cutting the tile the backing often peeled off which would not leave the desired look of a straight line, it would look all jagged.  Plus the glass shattered where cut on many tiles.  After this project I doubt that our installer will ever agree to work with glass tile again.  We have many areas that don't look good that we are going to have to try to take the tiles out and recut new ones and reinstall and not sure that will even make it look better.