The stones are as high as 2,5 height stones.
There are two parts on every design. Print the inlay up side down and glue them together.
For the STLs use the “split to object” function in Prusaslicer to split the parts.
Update 2022-04:
I have added an embossing to better identify the tunnels.
Also added STLs
The author marked this model as their own original creation.