An inexpensive angle grinder with a diamond blade can cut perfect circles and squares in the toughest tile. You can buy a 4- or 4-1/2-in. grinder and a dry-cut diamond blade for as little as $75.

You have several different options for cutting these tiles, including the wet saw, circular saw, and angle grinder ... a quick change to a diamond saw blade, like this EDiamond Tools 7-Inch ...