Proposed final?

Transformative Crystal - Red/Yellow (Fire/Air)

+2 Reflex (Air)
+2 Will (Fire)
Order of nature: +4 to saves versus supernatural abilities and effects (not spells or spell-like abilities)
NAT-2: Reduce damage done by natural attacks (not unarmed attacks) by 2.

Natreous Crystal - Red/Green (Fire/Earth)
+2 Will (Fire)
+3 CMD (Earth)
Dessication: +5 saves versus poison and disease
SLS-2: Reduce damage done by slashing damage that is not also bludgeoning and/or piercing by 2.

Nalthic Crystal – Red/Blue (Fire/Water)
+2 Will (Fire)
+2 Fort (Water)
Resist Nalthic Elements: Resist 5 Fire/Cold/Water
PRC-2: Reduce damage done by piercing damage that is not also bludgeoning and/or slashing by 2.

Saneelan Crystal – Yellow/Green (Air/Earth)
+2 Reflex (Air)
+3 CMD (Earth)
Resist Saneelan Elements: Resist 5 Elec/Acid/Sonic
Fortified Movements: Critical threats against you have a -5 elemental penalty to confirm

Flowing Crystal – Yellow/Blue (Air/Water)
+2 Reflex (Air)
+2 Fort (Water)
+10 Movement
Elusiveness: Touch attacks against you suffer a -2 elemental penalty

Preservation Crystal - Green/Blue (Earth/Water)
+3 CMD (Earth)
+2 Fort (Water)
BLD-2: Reduce damage done by bludgeoning damage that is not also slashing and/or piercing by 2.
Order of reality: +1 Saves versus spells and spell-like abilities