In the Shipwrecked DLC, fishing with a 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, the Slot Machine has a small chance to yield 3 Purple Gems as a possible reward. Purple Gems are used to craft the Howling Conch.
In the Hamlet DLC, there is a very low chance for Purple Gems to drop from HammeringA Smashing Pot. They can also be acquired from the End's Well. Purple Gems, unlike other gems, cannot be sold to Bankers.
Usage
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Tips
Thanks to periodic Hound waves, purple gems are renewable, even in the base game, as both Red Hounds and Blue Hounds drop Red and Blue Gems, respectively.
Since the July 30th, 2015 update, they are also renewable by fishing up Sea Worthers, Toy Boats, and Sextants from Flotsam and trading them to Wolly for Purple, Blue, and Red Gems, respectively.
The Purple Gem's crafting description is a reference to Captain Planet.
Purple Gems can be deconstructed using the Deconstruction Staff. However, since they're made using only gems, nothing will be dropped, wasting a Purple Gem.
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