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Shapton makes diamond hones in a variety of grits, some are incredibly high grit. I don't know of anyone that uses them for razors, so, whether or not they work well with straights, I don't know.

I know there's not many people who use diamond hones for razors, but, I found this little tidbit in my lee valley catalogue and figured it'd be good to know. It's about monocrystaline vs....