Yes it does and it is hard, very hard. I use a 140 diamond plate and it took some work. I had a small dip in the center of the stone and had to remove a bit of the stone face. The dip left scratches on the bevel until it was flat and smooth.

I then use a 300, 600 and 1200 diamond plates, then a 1k and 4k to smooth.

Grid the stone several times to get it flat, I think you will only have to do it once it is hard and will not be getting that many laps.

If you get scratches on a bevel, lap it again.

Check the other side to see which is flatter to begin with.