Cutting Stone Window Sills

[FONT=&quot]I'm having limestone windowsills put in a bay window and the sills will need to be cut.

I was just wondering what is the best type of blade to use on the con-saw??

Is there a special technique to use so as to not split / chip the stone?

All help would be greatly appreciated.
Thanks in advance
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A diamond blade for limestone, there are lots of different diamond blades for different types of stone