I've never used it on stone, but I don't know why it wouldn't work.

Its says "glass and tiles" but I've used it on some stones,
and so far so good. But mostly small stuff. I've also used
liquid nails on brick/stone with success. But that's not clear so you have to be careful for it to not show.

I hope we get to see your sculptures.
hugs, Karen

I have used it to glue small stones to bowling balls and it has worked for years. I don't know how well GE II will work for large/heavy rocks. Weight creates stresses and it may not be up to the job if you're using big stuff.

Let us know what you end up using and post pics!

~~Mimi

On the gorilla glue website it shows using it to put back stones on a verticle surface and set bricks. The secret is to have both receiving sides wet before applying. I use it a lot to repair large terracotta pots. I know it expands, but I have found if you stay with it and keep removing the expansion glue it is easier. I some times remove the rest or any I missed with a razor blade when dry.