Granite building stones or not?

[Scott Knudsen <s.knudsen@xxxxxxxxxxxxxxx>]

We have a crusher in northern Saskatchewan Canada in the Precambrian
Shield and we get lots of granite boulders that are to large to go
through our small crusher. They are roundish and range in sizes from 1'
to 3' and are many different colors. If I was to square four of their
sides up a bit with a diamond saw, would they be useful for building
stones? And if yes is an ordinary diamond rock saw the proper way to do
it? Im clueless when it comes to stone work.  Thanks

Scott Knudsen