The default maximum QualityQualityQuality grants small bonuses to an item depending on the type of item, up to a default maximum of 20%.
Martial Weapons gain 1% more Physical damage per Quality.
Armours gain 1% more Armour, Evasion, Energy Shield and Runic Ward per Quality.
Rings and Amulets have a number of possible quality types that provide bonuses to specific modifiers on the item.
Flasks gain 1% more Life and Mana recovery per Quality.
Charms gain 1% increased duration per Quality.
Skill Gems or equipment that grant Skills grant a specific bonus to their Skill based on their Quality. 20%.