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				moodgiesanta said: 
Plus, you can convert earth gems directly to gold, so you can explosively grow your earth gem income after a time. 
			
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 This is only true if you've found an alchemist site, or have the alchemist's stone, as a gold cost of 400 means that their upkeep is 13.3, which is 3.3 more than the 10 gold you get from each earth gem.