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.

like this EDiamond Tools 7-Inch Saw Blade, you could also cut bullnose tile. Be sure to check the arbor (hole) size and blade diameter match your saw. The same type of blade can also be bought for ...