The following support gems are recommendations by GGG as listed in-game, and do not necessarily reflect optimal combinations or the views of the wiki.
Gem tier
Support gems
I
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Controlled DestructionControlled DestructionSupport, Spell Category: Controlled Destruction Tier: 1Support Requirements: +5 IntSupports Spells that Hit enemies, boosting their damage but preventing them from dealing Critical Hits.Supported Spells deal 25% more Hit Damage Supported Skills cannot deal Critical HitsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Module Error: No results found for item using search term "item_name = Pierce"
II
Cold PenetrationCold PenetrationSupport, Cold Category: Cold Penetration Tier: 2 Cost & Reservation Multiplier: 120%Support Requirements: +5 IntSupports any skill that Hits enemies, making those HitsPenetrate enemy Cold resistance.Supported Skills Penetrate 30% Cold ResistancePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Considered CastingConsidered CastingSupport, Spell Category: Considered Casting Tier: 2 Cost & Reservation Multiplier: 115%Support Requirements: +5 IntSupports Spell Skills that Hit Enemies and you cast yourself, boosting Damage at the cost of Cast Speed.Supported Spell Skills have 15% less Cast Speed Supported Spells deal 35% more DamagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Module Error: No results found for item using search term "item_name = Ricochet"
III
Cold ExposureCold ExposureSupport, Cold, Duration Category: Cold Exposure Tier: 4 Cost & Reservation Multiplier: 120%Support Requirements: +5 IntSupports any skill that Hits enemies, causing it to inflict Exposure when it Critically Hits an enemy.Supported Skills inflict Exposure for 8 seconds on Critical Hit with Cold DamagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Cold MasteryCold MasterySupport, Cold Category: Mastery Tier: 5Support Requirements: +5 IntSupports Cold skills, granting them an additional level. Does not support skills which do not have levels.+1 to Level of Supported Cold SkillsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
Elemental FocusElemental FocusSupport Category: Elemental Focus Tier: 3Support Requirements: +5 IntSupports any skill that Hits enemies, causing it to deal more Elemental Damage but be unable to inflict Elemental Ailments.Supported Skills deal 25% more Elemental Damage Supported Skills cannot inflict Elemental AilmentsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
IV
V
Item acquisition
Eye of Winter has restrictions on where or how it can drop.