Standard (ceramic tile) blades that come with most wetsaws should NOT be used to cut glass tiles - or the tile will tear, crack and chip.
Instead, replace the wetsaw blade, removing the casing and blade bolt.
A seven inch, diamond electroplated glass tile blade fits in the old blade's place.
Tighten the bolt and replace the casing.
For clean cuts and blade longevity, make sure that the tray is completely filled with water.
When cutting, press lightly and steadily.
Allow the blade to do the work.
Used as directed, a good quality diamond electroplated glass tile blade will last for hundreds of cuts.