I bought a EA 60" single lid grapple and it works really good for picking rocks. Smaller ones fall thru, but for the big ones it works great. Last thing we tried was my JD pallet forks one notch apart and it works awesome! You can dig out rocks it cant even pickup, just slide them out of the way.
These are 2' to 3' diameter size.
You folks got any better ways? Always willing to try something better.