HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

That would be awesome! Diamond and Gold would fit perfectly.

Well, generally yes, although I should immediately note that the value of these objects is high, so on standard maps, they are generated only in the range of 10K-15K. This makes the usefulness of golem stashes questionable, because guards of that size are not always available to be cleared on the 1st week (except for Jeb), and taking them on the 2nd week is a bit late...