This is a video, produced by Sally Edenfield, in which she shows a honing grit progression on a 12×12 from 100-400g. The marble is Breccia Oniciata.
Production values were low due primarily to director shortcuts.
These dry diamonds are unique in that they only work on stone other than true geological marble. If you are honing a verticle surface they are great because you don’t have to let your work dry between cuts. A full set is about $250. They are available (3′) from MB Stone, as is the MB12 polishing powder. I am a customer and friend of MB Stone.