How do you make a hole in a piece of ceramic tile? Here are two different ways:
Draw the hole at the desired location then extend lines from the rim of the circle to the edge. Next carry these lines around to the back of the tile and reproduce them.
Inside the rectangle formed by the intersecting lines, draw the same circle on the back of the tile.
Using a hand-held grinder fitted with a diamond blade, carefully cut out the rectangle, the blade should barely perforate the tile face.
Flip the tile face up and using a rubber hammer, gently tap on the cut area until the waste material falls out.
Another way to create a hole in ceramic tile is by using a carbide hole saw made just for this purpose. Depending on the thickness and hardness of the tile, this can be a bit slow going but patience will usually pay off.