The RUBI nippers are what I now use to cut everything from ceramic to glass tiles.
They can cut extremely hard material, owing to their design and the addition of two tungsten carbide scoring wheels with titanium nitride surface treatment.
Especially for all those narrow strips of 3/8 in. wide or less that mosaic artists often have to remove and that they are unable to cut with a tile cutter.
The wheel is 11/16" diameter.
The long handle gives you extra leverage to cut harder materials.
I love these to cut 3/4" vitreous glass tiles in half or quarters!
Why pay for expensive nippers? These are equally good!