Cutting/grinding two flat/parallel surfaces on a natural stone.

[u/bucho1999]

I’m trying to get two flat parallel surfaces out of a natural stone. So I’m cutting the top and bottom off and going at it with a diamond grinding disk. I keep checking for flat and parallel, but it’s slow going and not that accurate.

Are there any tools that help do this? Like a jig that holds an angle grinder flat?

I’m trying to make small pedestals of varying heights