Meta gems
From WoWWiki
Meta gems match 
meta sockets. These gems have special requirements that must be met for the gem's bonus to activate. For example, in order to gain the benefits of a Destructive Skyfire Diamond there must be a minimum of 2 gems of each color between all the items currently equipped on the character.
It should be noted that gems which match multiple socket colors can fulfill meta gem requirements for any color they match. For example, if a meta gem needs 3 red and 2 yellow to activate, 3 orange (red/yellow) gems can activate this gem. Also, a gem does not have to match its socket to contribute to a meta gem; therefore, the player may choose to lose an item's gem bonus in order to activate the meta gem's bonus. So far only high-end helms have meta sockets.
| meta sockets. | ||||||
| Gem | Effects | Requirements | Source | |||
|---|---|---|---|---|---|---|
| [Thundering Skyfire Diamond] | Chance to Increase Melee/Ranged Attack Speed | Requires at least 2 Red gems, 2 Blue gems, 2 Yellow gems | C | |||
| [Destructive Skyfire Diamond] | +14 Spell Crit Rating | 1% Spell Reflect | Requires at least 2 Red gems, 2 Blue gems, 2 Yellow gems | C | ||
| [Enigmatic Skyfire Diamond] | +12 Critical Strike Rating | +5% Snare and Root Resist | Requires more Red gems than Yellow gems | Cf | ||
| [Mystical Skyfire Diamond] | Chance to Increase Spell Cast Speed | Requires more Blue gems than Yellow gems | C | |||
| [Swift Skyfire Diamond] | +24 Attack Power | Minor Run Speed | Requires at least 2 Yellow gems, 1 Red gem | Cf | ||
| [Swift Windfire Diamond] | +20 Attack Power | Minor Run Speed | Requires at least 2 Yellow gems, 1 Red gem | Vs | ||
| [Swift Starfire Diamond] | +12 Spell Damage | Minor Run Speed | Requires at least 2 Yellow gems, 1 Red gem | Vs | ||
| [Relentless Earthstorm Diamond] | +12 Agility | 3% Increased Critical Damage | Requires at least 2 Red gems, 2 Blue gems, 2 Yellow gems | Cf | ||
| [Tenacious Earthstorm Diamond] | +12 Defense Rating | Chance to Restore Health on hit | Requires at least 5 Blue gems | C | ||
| [Brutal Earthstorm Diamond] | +3 Melee Damage | Chance to Stun Target | Requires at least 2 Red gems, 2 Blue gems, 2 Yellow gems | C | ||
| [Insightful Earthstorm Diamond] | +12 Intellect | Chance to restore mana on spellcast | Requires at least 2 Red gems, 2 Blue gems, 2 Yellow gems | Cf | ||
| [Powerful Earthstorm Diamond] | +18 Stamina | 5% Stun Resist | Requires at least 3 Blue gems | Cf | ||
| [Bracing Earthstorm Diamond] | +26 Healing Spells +9 Spell Damage | 2% Reduced Threat | Requires more Red gems than Blue gems | Cf | ||
| [Potent Unstable Diamond] | +24 Attack Power | 5% Stun Resistance | Requires more Blue gems than Yellow gems | V | ||
| [Imbued Unstable Diamond] | +14 Spell Damage | 5% Stun Resistance | Requires exactly 3 Yellow gems | V | ||
| [Chaotic Skyfire Diamond] | +12 Spell Critical | 3% Increased Critical Damage | Requires at least 2 Blue gems | C | ||
| [Ember Skyfire Diamond] | +14 Spell Damage | 2% Intellect | Requires at least 3 Red gems | C | ||
| [Eternal Earthstorm Diamond] | +12 Defense Rating | +10% Shield Block Value | Requires at least 2 Blue gems, 1 Yellow gem | C | ||
