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The tile drills I prefer are shaped like a diamond, with softer sides. You can open up the holes as long as you're careful.
http://p.luckyretail.com/Uploadfile/20160510/001152/001152.jpg
realised this had already been answered...
Airhead
I drilled some 6mm holes in my bathroom tiles to put up a cabinet but I'm now having second thoughts about the fixings and have decided the holes need to be 8mm.
What's the best way to open them out without cracking? I used a diamond core bit which doesn't have any centre to locate in the existing hole so I imagine doing that neatly with an 8mm bit would be a bit of a sod.