Yes, a diamond wheel is the only thing that will truly cut carbide. A green wheel will break off carbide grains, but the resulting edge, while usable, is nowhere near as good as one ground with a diamond wheel.
Try to make a living, not a killing. -- Utah Phillips
Don't believe everything you know. -- Bumper sticker
Everybody is ignorant, only on different subjects. -- Will Rogers
There are lots of people who mistake their imagination for their memory. - Josh Billings
Law of Logical Argument - Anything is possible if you don't know what you are talking about.