Blue Gems can be used to turn Chester into Snow Chester by placing at least one in each of his inventory slots on a Full Moon, granting him slower food spoilage like a mobile Ice Box.
Blue Gems have a 0.04% chance to be dropped by Tumbleweeds.
Dragonfly and the Malbatross drop Blue Gems upon death. Blue Gem Deer will also drop a Blue Gem if killed or if Klaus is dead.
Sunken Chests can contain a Blue Gem, with equal chance of a Red Gem in its place.
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