Review on DiamondSure Granite Ceramic Porcelain Cutting Tools with Diamond Technology by Djkutt Kent

I've been told a diamond drill bit can penetrate tile. At least for us. Not as much. We eventually got it working, but we first had to hammer where we wanted to drill something else and then spend a lot of time and effort drilling it through the tile. We used porcelain stoneware (maybe that's the problem?). On a positive note the tile didn't crack or break and we ended up drilling holes.