I know how to change an icon this way.

What I'm looking for is an equivalent to changing the icon for an application in the launcher, i. e. the Home folder, via

gedit ~/.local/share/applications/nautilus-home.desktop

That way you can set an icon type, which is helpful when you later want to change the icon set resp. theme or when you want the best resolution for each size of the icon.

So, I know how I can do this for applications in the launcher - but how can I realize this for icon folders in Nautilus? (In which file these settings are stored and editable whith i. e. Gedit?)