Cataclysm engineering gems

Cataclysm Engineering gems are specific to . This is a listing of all meta Cataclysm gems by color.
Engineering gems, also called Cogwheels, are specific to Engineering, require Engineering level 525, and can only fit into a Cogwheel socket (found in Engineering specific helms).
They are sold by:
* in the Dwarven District, Stormwind
* in Highbank, Twilight Highlands
* in The Valley of Honor, Orgrimmar
* in Dragonmaw Port, Twilight Highlands
{| class="darktable"
|- style ="background: #666666;"
| colspan=8 | Cogwheel, match Cogwheel sockets.
|-
! Gem !! Effect !! Costs
|-class="alt"
| Flashing Cogwheel|| +208 Parry Rating || Volatile Seaforium Blastpack
|-
| Fractured Cogwheel|| +208 Mastery Rating || Goblin Barbecue
|-class="alt"
| Mystic Cogwheel|| +208 Resilience Rating || Mark of Honor x1
|-
| Precise Cogwheel|| +208 Expertise Rating || Lure Master Tackle Box
|-class="alt"
| Quick Cogwheel|| +208 Haste Rating || Handful of Obsidium Bolts x4
|-
| Rigid Cogwheel|| +208 Hit Rating || Elementium Toolbox
|-class="alt"
| Smooth Cogwheel|| +208 Critical Strike Rating || Handful of Obsidium Bolts x4
|-
| Sparkling Cogwheel|| +208 Spirit || Authentic Jr. Engineer Goggles
|-class="alt"
| Subtle Cogwheel|| +208 Dodge Rating || Handful of Obsidium Bolts x4
|}