Cut a stone

From BonsaiWIKI

You split a diamond, but you cut a suiseki.

For cutting small stones up to 3 inches or 60mm, you could use a dry diamond saw blade in a circular saw. Clamp the stone to a table with a wet rag around the stone under the clamp, so as not to scar it. Then cut away. This works if you are handy. If you are not, then check in the "yellow pages" (I don't know if they have them in the UK) under "lapidary" and maybe they could turn you on to someone that may be able to cut it for you.

If it's a really big stone, then get out the yellow pages again and look for graveyard monument craftsmen. They have the continuous, diamond-coated wire type saws that can cut the really big ones.