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I have had the best results when putting miners at different mines/mine levels, and been getting the most gems 0-12 hours after server maintenance.
When COtobo says that you mined a gem and it keeps disconnecting you disable the gem disconnector and it won't disconnect you again.
I don't know why the gem disappeared when you logged in, I think you've mixed up your miners because COtobo does not drop anything else besides ores.
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