Meta gems are special gems that have specific requirements for use:
Meta sockets are only available on certain, higher-level head slot items. Unlike other sockets that will accept a different color of gem (i.e. you can put a blue gem in a yellow socket if you want), meta sockets only accept meta gems. However like other sockets, once a gem is socketed there, there's no way to remove it and "get it back". You can replace it with another meta gem, but the existing gem in the socket is destroyed in the process.
Every meta gem will have a requirement on it which must be true in order to get the benefit of the gem. In other words, if you don't meet the requirement it's nothing more than a pretty bauble, but you can't even use it for fishing. Sometimes the requirement is a hard number like "Requires at least 2 blue gems, 2 red gems and 2 yellow gems". Sometimes it's more general: "Requires more red gems than yellow gems". Note that one meta gem even has an exact number. The Imbued Unstable Diamond requires exactly 3 yellow gems. No more, no less.
Be aware that this applies to all of the gems across all of your gear, not just any additional sockets in the hem itself. It's also important to know that the non-primary color games will give you credit toward both of their colors.
Primary gem colors are: Red, Blue and Yellow Non-Primary gem colors are:
Basically the non-primary gems will meet the requirements of both of the color sockets they fit as stated on the tooltip.
So if, in your gear, you only had 2 orange gems, you would still meet the "2 yellow, 1 red" requirements for the Swift Starfire Diamond even though that description seems to imply that you need 3 gems to meet it, the orange gem counts as both a yellow and a red gem.
|Meta Gem||Primary Effect||Secondary Effect||Requirements||Obtained Through||Level|
|Bracing Earthstorm Diamond||+26 Healing +9 Spell Dmg||2% Reduced Threat||More Red gems than Blue gems||Jewelcrafting||70|
|Brutal Earthstorm Diamond||+3 Melee Damage||Chance to stun target||at least 2 red, 2 yellow and 2 blue gems||Jewelcrafting||70|
|Chaotic Skyfire Diamond||+12 Spell Critical rating||3% Increased Critical damage||More Red gems than Blue gems||Jewelcrafting||70|
|Destructive Skyfire Diamond||+14 Spell Critical Rating||1% Spell Reflection||At least 2 Red, 2 Blue and 2 Yellow gems||Jewelcrafting||70|
|Ember Skyfire Diamond||+14 Spell Damage||+2% Intellect||At least 3 red gems||Jewelcrafting||70|
|Enigmatic Skyfire Diamond||+12 Critical Strike Rating||5% snare and root resist||More Red gems than Blue gems||Jewelcrafting||70|
|Eternal Earthstorm Diamond||+12 Defense Rating||5% Shield Block Value||At least 2 Blue gems and at least 1 Yellow gem||Jewelcrafting||70|
|Imbued Unstable Diamond||+14 Spell Dmg||5% Stun Resistance||Exactly 3 Yellow Gems||Vendor (Apexis Shards, BEM)||70|
|Insightful Earthstorm Diamond||+12 Intellect||Chance to restore mana on spellcast||At least 2 Red gems, 2 Yellow gems and 2 Blue gems||Jewelcrafting||70|
|Mystical Skyfire Diamond||Chance to increase spell cast speed||none||More Blue gems than Yellow gems||Jewelcrafting||70|
|Potent Unstable Diamond||+26 Attack Power||5% Stun Resistance||More Blue gems than Yellow gems||Vendor (Apexis Shards, BEM)||70|
|Powerful Earthstorm Diamond||+18 Stamina||5% stun resist||At least 3 Blue gems||Jewelcrafting||70|
|Relentless Earthstorm Diamond||+12 Agility||3% Increased Critical Damage||At least 2 Red gems, 2 Yellow gems and 2 Blue gems||Jewelcrafting||70|
|Swift Skyfire Diamond||+24 Attack Power||Minor run speed increase||At least 2 Yellow gems and 1 Red gem||Jewelcrafting||70|
|Swift Starfire Diamond||+Spell Damage||Minor run speed increase||At least 2 Yellow Gems and 1 Red gem||Vendor (Spirit Shards Terokkar Forest)||70|
|Swift Windfire Diamond||+20 Attack Power||Minor run speed increase||At least 2 Yellow Gems and 1 Red gem||Vendor (Sprirt Shards Terokkar Forest)||70|
|Tenacious Earthstorm Diamond||+12 Defense Rating||Chance to restore health on hit||At least 5 Blue gems||Jewelcrafting||70|
|Thundering Skyfire Diamond||Chance to increase melee or ranged attack speed||none||At least 2 Red gems, 2 Yellow gems and 2 Blue gems||Jewelcrafting||70|
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