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A gem is generally an item that can be used as an ingredient primarily for jewelcrafting recipes or placed into a socket of another item to give that item additional bonuses, powers and/or procs. Jewelcrafters can turn raw gems into socket gems or various jewelry items like rings and necklaces. The term "gem" can be used for raw or cut stones, but is often only used to describe cut gems. A gem cannot be removed once it is placed into a socket, however it can be overwritten by another, destroying it in the process.
Colored gems are the most common type of socketable gem. They come in the colors red, blue, yellow, green, purple, and orange. They provide stat bonuses when socketed. They can be placed in any colored socket, or a prismatic socket. They will activate an item's socket bonus if the correct color gems are matched up with the socket colors. A certain number of certain colored gems may be required in order to activate meta gem.
The primary colored gems are red, yellow, and blue. Each color is associated with a specific set of stats, as in the following table:
|Red gems||Yellow gems||Blue gems|
|Expertise||Critical Strike Rating||Hit Rating|
|Agility||Haste Rating||PvP Power|
|Parry Rating||PvP Resilience|
The green, purple, and orange gems are considered hybrids. Each of these gems offers a combination of two stats according to the parent colors. For example, a purple gem may provide bonuses to expertise (a "red" stat) and hit rating (a "blue" stat). All of the colored gems of a particular tier have the same benefit weighting. A hybrid gem's two bonuses will each be half what the primary gem would have provided. For example, the , a blue gem, provides +60 stamina, and the , an red gem, provides +40 parry. The hybrid of these two is the purple , with +30 stamina and +20 parry.
Each hybrid gem can match a socket of either parent color for the purpose of activating an item's socket bonus. A green gem will match a blue or yellow socket, a purple gem will match a blue or red socket, and an orange gem will match a red or yellow socket. The hybrid gems also count for each parent color when activating a meta gem.
Prismatic gems act as colored gems, and count as all three colors. They will match any color socket for the purpose of activating an item's socket bonus, and will count as all three colors for activating a meta gem. There are two varieties of these gems: one variety that improves all resistances, and one that improves all five attributes.
The Burning Crusade and Wrath of the Lich King expansions introduced prismatic gems, but there are not as yet any prismatic gems associated with Cataclysm.
Meta gems are more powerful gems that can only go in a meta socket. Meta sockets are found only on powerful headgear, and there is only one socket per piece. Meta gems may require some colored gems to be equipped in order to be activated; for example, a meta gem may require you to equip items that have two blue and one red colored gems socketed.
A gem does not have to match its socket color to count toward a meta gem's bonus. For purposes of activating a meta gem's bonus, a hybrid colored gem counts as one gem of each of the two colors. A prismatic gem counts as one gem of each of the three colors.
Cogwheel gems fit into cogwheel sockets, which are found on the Bio-Optic Killshades epic engineering-crafted goggles. When first manufactured, these goggles have very poor stats, but the cogwheel gems are quite powerful in order to compensate. This allows the engineer to customize the goggles for any class specialization. It allows the goggles to be used by any class without the need for a large number of goggle schematics.
Gem bonuses are activated when they are placed in equipment sockets and the equipment is worn. To begin socketing an item, hold down shift and right-click the item. A dialogue window will open which allows the gems to be placed in the sockets.
Gems cannot be removed from sockets once finally placed. However, they can be replaced by placing new gems in the same socket. The old gem will be destroyed once the new gem's socketing is finalized.
- Colored sockets are associated with a socket bonus. Each piece of equipment with colored sockets has a stat bonus available, which becomes activated when the correct color gems are placed in each colored socket. However any coloured gem can be place in any coloured socket if you aren't interested in the socket bonus. The hybrid color gems (purple, green, and orange) may be used to activate a socket of either parent color. Prismatic gems will match any color socket.
- Prismatic sockets accept colored and prismatic gems. They are not associated with any additional bonus. They are usually added to bracer or waist items through the activity of a blacksmith. They were also found on Relics.
- Meta sockets are found individually on powerful headgear. They accept only meta gems.
- Cogwheel sockets are found on the Bio-Optic Killshades epic crafted goggles which require engineering. There are two cogwheel sockets in this headpiece. They accept only cogwheel gems. They are also found on the trinket which has no engineering requirement.
These pages concern the gems new to Cataclysm.
These pages concern the gems new to Wrath of the Lich King.
Northrend epic gems can be purchased with 220 from vendors in Dalaran:
These pages concern the gems specific to the Burning Crusade era.
- Gemology is a study of gems.
- A full list of all minerals, ores and crystals has been compiled here.