Purple Gems can be obtained by mining Ancient Statues, destroying Broken Clockworks, opening Ornate Chests, or as a drop from both variants of the Clockwork Bishop. Maxwell starts out with a Purple Gem in his inventory.
Purple Gems are used to craft the Shadow Manipulator, Bat Bat, Telelocator Staff, and Nightmare Amulet. Three (3) Purple Gems must be installed in a Telelocator Focus before it will function, and they will be consumed when the Telelocator Focus is used.
In Shipwrecked DLC, fishing with Trawl Net in deep Ocean has a small chance to catch a purple gem. The chance is higher during Hurricane Season and Dry Season. X Marks the Spot treasure chests occasionally contain a Purple Gem. Additionally Slot Machine has a small chance to yield 3 Purple Gems as a possible reward.
- The Purple Gem was added in the A Little Rain Must Fall update.
- The Purple Gem's element appears to be darkness or madness; its opposite being the Yellow Gem.
- The Purple Gem's description is a reference to Captain Planet.