I use a range of diamond coated burrs with my Dremel type rotary grinder. This is a short "about" video. I use Parkside rotary grinders and Ferrex flex tools but this applies to any make of tool. My interest is stone agate and marble carving and engraving but these diamond tools can be used on many other types of material.
A huge range of diamond burrs: https://amzn.to/35xRGiE
My favourite set of burrs: https://amzn.to/31OOHl1
I like these coarser ones: https://amzn.to/37QaoVB
These cutting wheels are invaluable: https://amzn.to/2HwP257
To find diamond burrs on eBay https://ebay.to/2Z2VabD