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
Fast ForwardFast ForwardDuration Tier: 1 Level: 1Supports any skill that has a duration, making that duration shorter.Supported Skills have 30% less Skill Effect DurationPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
PersistencePersistenceDuration Tier: 1 Level: 1 Cost & Reservation Multiplier: 120%Supports any skill that has a duration, making that duration longer.Supported Skills have 40% more Skill Effect DurationPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
II
Coming Soon
HerbalismHerbalismBuff, Persistent Tier: 2 Level: 1Supports Persistent Buff Skills, causing you to gain increased Life recovery from Flasks while the Skill is active.30% Increased Recovery from Life Flasks while a Supported Skill is activePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
III
Cold MasteryCold MasteryCold Tier: 3 Level: 1Supports Cold skills, granting them an additional level.+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 copies of the same Support Gem socketed at the same time.
Fire MasteryFire MasteryFire Tier: 3 Level: 1Supports Fire skills, granting them an additional level.+1 to Level of Supported Fire SkillsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
Item acquisition
Elemental Conflux has restrictions on where or how it can drop.