Remove stone from the chimney breast indoors

[Radhusmedträdgård]

Hello,
We have a chimney with an open fireplace that has a stove installed in it. I noticed that some stones are loose because the adhesive dried out. It looks like white plaster underneath. Exactly what I wanted. Can I just remove/knock/break them off or do I need to contact a chimney sweep or someone similar here? Attaching pictures.

 

[Biggle]

Hi,
We have a chimney with an open fireplace that has a stove in it. I noticed that some stones are loose because the adhesive has dried. Looks like white plaster underneath. Exactly what I wanted. Can I just remove them/chisel/break them off, or do I need to contact a chimney sweep or similar here? Attaching pictures.

It's probably just a matter of knocking them down. It's like a brick wall in a pizzeria. Just cosmetic

 

[Radhusmedträdgård]

It's probably just to knock it down. It's like a brick wall in a pizzeria. Just cosmetics

And sand off the gray glue?

 

[Biggle]

And sand away the gray glue?

Or polish over with plaster or similar.