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oh, well there's that option too, i guess. ...;).

there is such a thing as a black diamond, though, I think they're man-made and can be big enough to use in jewelry but are not as desirable and...

Sounds like a gimmick to me, the diamonds used for diamond hones are man-made monocrystalline diamonds, that are as hard as the real thing for all intents and purposes. So making a hone out of black...