List of gems

Material	Effect	Acquisition
Heavy Gem	Increases the Str. Scaling, and reduces the base damage and Dex. Scaling. Requires the Farron Coal to Infuse.	Gift from Hawkwood in Firelink Shrine or dropped on death. Dropped from Crystal Lizards (US/FK/GA), Rotten Slugs, Dagger Ghrus, Mad Ghrus, Elder Ghrus, and Millwood Knights. Painted World of Ariandel treasure.
Sharp Gem	Increases the Dex. Scaling, and reduces the base damage and Str. Scaling. Requires the Farron Coal to Infuse.	Dropped from Crystal Lizards in the Undead Settlement and Grand Archives. Dropped from Skeleton Swordsmen, Graven Warden Skeletons, and Corvian Knights. Catacombs of Carthus treasure.
Refined Gem	Balances the Str. and Dex. scaling and reduces the base damage.	Dropped from a Crystal Lizard in the Grand Archives. Dropped from Red-eyed Lothric Knights wielding a sword and shield or spear and greatshield. Lothric Castle treasure.
Raw Gem	Increases base damage and removes Str. and Dex. Scaling.	Dropped from a Crystal Lizard on the High Wall of Lothric. Dropped from Praying Hollow Soldiers, Hollow Soldiers, Hollow Assassins, and Large Hollow Soldiers. Lothric Castle treasure.
Crystal Gem	Adds Magic damage and Int. Scaling, and reduces the base damage and Str. and Dex. Scaling. Cannot be Buffed. Requires the Sage's Coal to Infuse.	Dropped from Crystal Lizards in the Road of Sacrifices and the Grand Archives. Dropped from Sage's Prentice, Sage's Devout, Large Devouts of the Deep, Hollow Slaves in the Grand Archives, Archive Scholars, and Icy Great Crabs.
Simple Gem	Adds Magic damage, Int. Scaling, and FP Regen, but reduces the base damage and Str. and Dex. Scaling. Cannot be Buffed. Requires the Giant's Coal to Infuse.	Dropped from a Crystal Lizard in Irithyll of the Boreal Valley. Dropped from Jailers in Irithyll Dungeon. Irithyll Dungeon, Painted World of Ariandel, and The Ringed City treasure.
Fire Gem	Adds Fire damage, but removes all Scaling. Cannot be Buffed.	Dropped from a Crystal Lizard in Catacombs of Carthus. Dropped from Lantern Peasant Hollows in Undead Settlement, Smouldering Conjurator Ghrus, Smouldering Mad Ghrus, and Smouldering Rotten Flesh. Can be chosen as a Burial Gift.
Chaos Gem	Adds Fire damage and Int./Fth. Scaling, and reduces base damage and Str. and Dex. Scaling. Cannot be Buffed. Requires the Giant's Coal to Infuse.	Dropped from Crystal Lizards in Smouldering Lake and the Grand Archives. Dropped from Demon Clerics. Smouldering Lake treasure.
Lightning Gem	Adds Lightning damage and Fth. Scaling, and reduces base damage and Str. and Dex. Scaling. Cannot be Buffed. Requires the Giant's Coal to Infuse.	Received from the Nestling for the Xanthous Crown. Dropped from Serpent-men and Large Serpent-men in Archdragon Peak, (Overgrown) Greatsword Lothric Knights, and Lothric Thieves. Irithyll of the Boreal Valley and The Ringed City treasure.
Blessed Gem	Adds Fth. Scaling and HP Regen, but reduces the base damage and Str. and Dex. Scaling. Cannot be Buffed. Effective against Undead. Requires the Sage's Coal to Infuse.	Received from the Nestling for the Moaning Shield. Dropped from Winged Knights, Cathedral Evangelists, Lothric Priests, Gertrude's Knights, and Hollow Clerics. Cathedral of the Deep, Grand Archives, Painted World of Ariandel, and The Ringed City treasure.
Deep Gem	Adds Dark damage, but removes all Scaling. Cannot be Buffed. Requires Sage's Coal to Infuse.	Dropped from Hollow Slaves in Cathedral of the Deep, Deacons, and Murkmen. Cathedral of the Deep and Irithyll of the Boreal Valley treasure.
Dark Gem	Can be used to infuse weapons, adding Dark damage, as well as Int. and Fth. scaling.	Dropped from Rotten Slugs in the Consumed King's Garden.
Blood Gem	Adds Bleed, but reduces the base damage and Str. and Dex. Scaling. Cannot be Buffed. Requires the Profaned Coal to Infuse.	Dropped from Irithyllian Slaves and Irithyllian Soldier Slaves. Irithyll of the Boreal Valley and Painted World of Ariandel treasure.
Poison Gem	Adds a Poison effect, but reduces the base damage and attribute bonuses.	Dropped from Elder Ghrus, Ghrus, and Rotten Slugs in the Farron Keep.
Hollow Gem	Adds Luck scaling; Reduces the base damage, and Str. and Dex. scaling.	Dropped from Corvian Storytellers in Road of Sacrifices and Untended Graves.
Shriving Stone	Removes infusions from weapons.	Dropped from Corvians.