Sharpening carbide?

Anybody know how to sharpen a carbide engraving bit? Took the point off one today. Only used it for like, 2 seconds… That was an expensive 2 seconds! It’s one of these. Lost about a mm off the end, so I figure I can probably just put a point on it.

Well I tried a diamond cutoff wheel on my dremel. It works! I know my angles are all off now, but it has a sharp pointy part again.