In cutting mosaic glass tiles for installation, you should avoid attempting to cut tiles that are already cracked. With the exception of a wet saw, almost any type of glass tile cutter will place pressure on the tile and it is almost certain to break a tile that is already cracked.
Safest Mosaic Glass Tile Cutters
Even the best glass cutter can break, crack, or shatter a mosaic glass tile if it is used improperly. To achieve the best results in cutting your mosaic glass tiles, avoid trying to cut cracked tiles and use a mosaic glass tile cutter.