-Each Rank up has a chance to add a Socket (Maximum of 3 Sockets).
-Sockets are used to add Elemental Bonuses attributed by Colored Zards.
-Extra Stones do not take up Sockets, there are just bonuses that can be added to any Weapon or Armor at a maximum of three times.
Armors: Add Defense Power +2 each time added (Max: +6)
Weapons: Add Attack Power +5 each time added (Max: +15)
Light (COLOR)= Lesser Zard, +2 Bonus Elemental Damage
Dark (COLOR)= Greater Zard, +3 Bonus Elemental Damage
Lesser Zards drop from Captains/Bosses Level 70 and below.
Greater Zards drop from Captains/Bosses Level 70 and above
Originally posted by tvONROP at the ijji forums