Somehow I failed to upload the picture. Here it is: https://imgur.com/a/Fb9uv2r

If the stone is porous, you can use concrete stain over the stone.

Whatever you do, test it in the most hidden stone first.

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I think it is really a cement mix so this would work you are right. Thanks!

It's probably not going to be possible to go lighter, but darker would be easy. Concrete stain as the other guy mentioned. If they're manufactured stone , the color is likely mixed into the material, so you probably can't remove the outside layer to reveal a more base color. You could try chipping away the surface on a more out of the way stone, see if it's a different color underneath. If it is, then you can abrade the color off with a sander, chisel, or sand blaster. If it's solid color all the way thru, your only chance is to dye it darker

good point. It is front and center afterall.

I like this suggestion. One thing that would worry me is whether I will be able to remove a layer and not end up with a piece that really looks badly chiseled. I think the dye on the most offering pieces is just a layer on top. This gives me some hope. The grey and beige "stones" seem to have the dye all throughout. Have you tried sandblasting? Any experience with how it will look at the end?

I have a portable media blaster I use on various things. I've seen a lot of blasted rocks and block, you'd just have to be careful as hell with doing it installed like that, cus the grout is going to break off way easier than the stone.