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Playing Ulm I never had too many Fire and Earth Gems, forging and Construction "summons" eat up your gems steadily !
However Pocus described me a "financial" Alchemist strategy : with Nature & Fire a RB can forge a boatload of Fever Fetish (give' em to Scouts) producing many Fire gems, that you can sell for cash. Only problem is that this requires your RB himself to forgeing items, so you lose on research/site searching (that's what the guy should do else...)