[I would also recommend the hammer and chisel route unless you need/want a really clean cut. In that case, you don't have to use diamond blades, but you would need to get the carbide chop blades (not real expensive ) and it should cut through it like butter. I've used that type on a circular saw to cut brick to the shapes and sizes I desired and it is much harder than the fiji. On another note though, and another reason to just chisel it... is the excess saltwater inside will be slung around whatever saw you use... and it doesn't help lubricate machinery much. :idea:
HTH]