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Drops from monsters

Let's say you want to get some rare drops, like a master crafting diagram.
Different monsters drop different amounts of gold. Is this amount of gold connected to the chance of a rare drop?
If I farm 5,000 gold from mongbats or 5,000 gold from Frigid Archfiends, is there a difference in my chances of getting a master crafting diagram?
Is there a minimum difficulty class or gold drop amount before a monster will drop master crafting diagrams?
Are there treasures that only drop from minibosses or bosses?