PoE2
Added Cold Damage
Support
Cold
Requires: Level 1
Support Reqirements: +5 Int
Supports Attacks, causing them to gain Cold Damage but deal less Fire and Lightning Damage.
Supported Attacks gain 25% of Damage as Cold Damage
Supported Skills deal 50% less Fire and Lightning Damage
Place into a Skill's Support Gem socket in the Skills menu to apply its effects to that Skill. You cannot have multiple copies of the same Support Gem socketed at the same time.
PoE1
Added Cold Damage Support
Cold
Support
Level: (1–20)
Cost & Reservation Multiplier: 120%
Requires: Level (8–70), (18–111) Dex
Supports any skill that hits enemies.
Supported Skills have (4–152) to (6–228) added Cold Damage

Additional Effects From Quality:
Supported Skills deal (0–10)% increased Cold Damage
This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Skill Gem you wish to augment. Right click to remove from a socket.