Gems are items found in Don't Starve and Don't Starve Together. There are 6 types of gems in , plus a 7th in . Gems are the only crafting component that cannot be recovered with the Deconstruction Staff (the only exception is the Iridescent Gem).
Common[]
The Purple, Blue, and (less common before the first summer) Red gems are mainly used as crafting components for items in the Magic Tab. They are typically found in seasonal hound loot, clockwork bishops, graves, and stalagmites. The Purple gem can also be crafted from a Blue and Red Gem at the Prestihatitator.
Uncommon[]
The Green, Orange, and Yellow gems are used for crafting items in the Ancient Tab. They are typically found in the Ruins, Sunken Chests, and in boss loot.
Rare[]
The Iridescent Gem is the rarest and only used for activating the Archive Switch or for crafting the Lunar Grimoire. Two of these gems are already in the archive switch (3 are needed to activate it). Additional ones can be created by deconstructing a Moon Caller's Staff after completing a full-moon ritual at the Moon Stone. Wilson's level 3 Transmute Gems alchemy can turn a complete set of the six other gems into an Iridescent Gem.