Purple Gems affect Fury and special attacks. There are 15 Purple Gems available, one of which is exclusive to Tumble.

A full description of the extent of the powers of the Fury Reels gem should be provided at this point. The Fury Reels (Fever Slots in the Japanese version) change your Fury meter into a slot machine when you activate your Fury. The combination of the 3 pictures in the slots will give you a specific bonus when you use Fury, and are explained here:

Three Swords: Berserk – Every hit is critical during Fury.
Three Armors: Aegis – Invincibility during Fury.
Three Skull: Bad Luck – You lose your Fury.
Three Lucre: Jackpot – Large Lucre drops from enemies during Fury.
Three Gumdrop: Full HP – HP is restored to full.
Two of a kind: HP Up – 50% of your total HP is restored.
All different: Nothing – Fury acts as normal.

	Size	Gem Name	Obtained from	Effect
1		Light on a Maiden	Tumble Subquest	Bow ATK +20, INT +10, and DEX +10
2		Glittering Crystal	Gem Fusion 1000	DEX (critical hit probability) +10
3		Unusual Shimmer	Talk to Moti after completing 99 Multiplayer Games or more	Higher DEX the more you complete areas in multiplayer
4		Cruel Sword	Gold Reward from Mana Tower	When you are in Fury, your focused sword attacks reach level 2
5		Cruel Flail	Gold Reward from Star Lake	When you are in Fury, your focused flail attacks reach level 2
6		Cruel Bow	Gold Reward from Fiery Sands	When you are in Fury, your focused bow attacks reach level 2
7		Cruel Hammer	Gold Reward from Ice Citadel	When you are in Fury, your focused hammer attacks reach level 2
8		Fury Reels	Gift from Bomb Brothers after 1st Mission	Enables Fury Reels when you enter Fury
9		Ruthless Sword	Gem Fusion 4000	When you are in Fury, your focused sword attacks reach level 3
10		Ruthless Flail	Gem Fusion 4000	When you are in Fury, your focused Flail attacks reach level 3
11		Ruthless Bow	Gem Fusion 3000	When you are in Fury, your focused hammer attacks reach level 3
12		Ruthless Hammer	Gem Fusion 3000	When you are in Fury, your focused hammer attacks reach level 3
13		Morale Boost	Gem Fusion 4000	Makes the Fury gauge fill faster
14		Spirit of the Hero	Gem Fusion 5000	Doubles duration of Fury
15		Ruthless Gemma	Gold Reward from Cosmic Rift	When you are in Fury, all focused attacks reach level 3
16		Double Fury	Gold Reward from Brightwood	Doubles experience earned while in Fury

Purple Gem Fusion

Fused Gem		Cost	Component Gem		Component Gem
	Glittering Crystal	1000		Crystal of Strength		Crystal of Lore
	Ruthless Sword	4000		Mighty Defense		Salamander’s Favour
						Undine’s Favour
						Gnome’s Favour
						Jinn’s Favour
				Sonic Wave		Dryad’s Favour
						Luna’s Favour
						Wisp’s Favour
						Shade’s Favour
				Crystal of Strength		Salamander’s Favour
						Shade’s Favour
	Ruthless Flail	4000		Steal Hook		Crystal of Lore
						Salamander’s Favour
						Undine’s Favour
						Gnome’s Favour
						Jinn’s Favour
				Multiple Swings		Dryad’s Favour
						Luna’s Favour
						Wisp’s Favour
						Shade’s Favour
				Crystal of Strength		Undine’s Favour
						Luna’s Favour
	Ruthless Bow	4000		String Resonance		Salamander’s Favour
						Undine’s Favour
						Gnome’s Favour
						Jinn’s Favour
				Triple Shot		Dryad’s Favour
						Luna’s Favour
						Wisp’s Favour
						Shade’s Favour
				Crystal of Strength		Jinn’s Favour
						Wisp’s Favour
	Ruthless Hammer	3000		Great Tremor		Salamander’s Favour
						Undine’s Favour
						Gnome’s Favour
						Jinn’s Favour
				Heavy Swing		Dryad’s Favour
						Luna’s Favour
						Wisp’s Favour
						Shade’s Favour
				Crystal of Strength		Gnome’s Favour
						Dryad’s Favour
	Morale Boost	4000		Any of the following		Any of the following
				Sonic Wave		Salamander’s Favour
				Multiple Swings		Undine’s Favour
				Triple Shot		Gnome’s Favour
				Heavy Swing		Jinn’s Favour
	Spirit of the Hero	5000		Any of the following		Any of the following
				Steal Hook		Dryad’s Favour
				Mighty Defense		Luna’s Favour
				String Resonance		Wisp’s Favour
				Great Tremor		Shade’s Favour
				Crystal of Lore		Steal Hook
						Sonic Wave
						Multiple Swings
						Triple Shot
						Heavy Swing
						Mighty Defense
						String Resonance
						Great Tremor