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:
Billibub Cogspinner [63, 31] in the Dwarven District, Stormwind- Frank Natale [79, 76] in Highbank, Twilight Highlands
- Sovik [75, 25] in The Valley of Honor, Orgrimmar
- Zim Bamzabble [77, 52] in Dragonmaw Port, Twilight Highlands
 Cogwheel sockets. | |||||||
| Gem | Effect | Costs | |||||
|---|---|---|---|---|---|---|---|
 [Flashing Cogwheel] |
+208 Parry Rating |  [Volatile Seaforium Blastpack]
| |||||
| [Fractured Cogwheel] |
+208 Mastery Rating |  [Goblin Barbecue]
| |||||
| [Mystic Cogwheel] |
+208 Resilience Rating |  [Mark of Honor] x1
| |||||
| [Precise Cogwheel] |
+208 Expertise Rating |  [Lure Master Tackle Box]
| |||||
| [Quick Cogwheel] |
+208 Haste Rating |  [Handful of Obsidium Bolts] x4
| |||||
| [Rigid Cogwheel] |
+208 Hit Rating |  [Elementium Toolbox]
| |||||
| [Smooth Cogwheel] |
+208 Critical Strike Rating | [Handful of Obsidium Bolts] x4
| |||||
| [Sparkling Cogwheel] |
+208 Spirit |  [Authentic Jr. Engineer Goggles]
| |||||
| [Subtle Cogwheel] |
+208 Dodge Rating | [Handful of Obsidium Bolts] x4
| |||||