- It is found in a chest in the library after fighting Father Gascoigne, before entering the Cathedral Ward.
The Blood Gem Workshop Tool allows the Hunter to add or remove Blood Gems to and from weapons when used at the Workshop in Hunter's Dream. Note that the weapon in question must be upgraded to at least +1 before Blood Gems can be slotted into it.
- It is entirely possible to play the game without ever picking up this item. This isn’t the recommended course of action, though.
- This item leaves the player's inventory if they begin a new playthrough. This means that players must reacquire it from its original location.
- It resembles a hand operated presser. Bloodied, likely from pressing Blood Gems.