Welcome,
It’s mandatory to internalise your relevant Rhino geometry in Grasshopper, before uploading your file here. Otherwise, it will be missing, when somebody downloads your file to inspect it!
Since your geometry is relatively straightforward, I managed to reconstruct something similar, however you should note that posts with missing geometry are usually ignored around here, since that points out that the user hasn’t even read the forum rules/instructions.
Instead of using the LunchBox component that produces diamond grid nodes with no cell information, you can use the one that returns the cells instead and go from there.
Diamond grid 001.ghx (359.5 KB)