I've been playing about with the combat simulator all morning and have finally settled on initial stats for crystals. The system is going to be coded in a way that it can be changed at a later date if it is found to be unbalanced or leads to a lack of variety in crystal usage.

I'll leave it to players to work out the best crystals for the best items as it's incredibly complicated and situational. I imagine it will be possible to tailor make your item set-up to defeat certain players, for example... the exact usefulness of damage is based on your opponents armor and hit points. Having more speed or damage than required renders any excess useless and so on.

Fragments and Shards will not be socketable and can only be used to make larger crystals.

Null (Speed), Pink (Def), Orange (Melee), Green (Gun) and Yellow (Proj) Crystals:
Small +4%, Medium +8%, Large +12%, Giant +16%, Perfect +20%

Void (Armor) and Fire (Damage) Crystals:
Small +2%, Medium +4%, Large +6%, Giant +8%, Perfect +10%

Air (Accuracy) and Water (Dodge) Crystals:
Small +1%, Medium +2%, Large +3%, Giant +4%, Perfect +5%

I'm going to release with these values and no diminishing returns for stacking crystals on one items. Any changes to the system will come with free unsocketing of items.

The percentages of all socketed crystals will be added up before being applied. So 4 perfect fire crystals will grant +40% min and max damage on a weapon. Still lots to code and test, feedback is welcome and things will be tested on the Dev server before being implemented here.