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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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