When we see stone out in its natural setting, bushland, it will usually look quite rough. Even when you view it as a garden wall it may look rough, but it does not have to. Smooth stone is much better for internal use because if you bump against it, you won’t scrape skin off. Stone cladding that is diamond cut is smooth.
You may have thought the term diamond cut was something to do with the shape of the block. In fact, the term refers to the diamond tipped tools that are used to cut the blocks into the required size and shape. Diamond is a very hard surface, so the saws used to cut through the stone are extremely sharp and can go at a high speed without becoming blunt. This is what gives the stone its smooth finish.