The Diamond is the fourth tier out of 6 available gems. It is also the last tier to upgrade tools with.
A player will at least need 15 Diamonds to upgrade tools and complete quests with. Note that the Knight requires a Diamond Chisel, so it's not counted towards that amount. Tools have to be upgraded with a Ruby first.
|1 each||Require upgrade with Ruby first|
|variable||Enchanted version gives double stardust|
|variable||The Diamond Key Chest has 5 item slots|
|5||Double the mined promethium from Excavators|
|1*||* The Knight requires a Diamond Chisel, not a diamond itself|
|Elite Mining Achievement||1|