How to find your wanted socketable gems in the AH
All non BoP socketable gems are named in a particular two-part pattern:
<Stats> <Gem Name>
Where <Stats> represents a name that defines what stats the gem have and <Gem Name> represents the quality of the item. Rare quality gems gives more of each stat than uncommon quality gems. So for and example a Brilliant Dawnstone is a yellow gem that gives a high amount of intellect while a Brilliant Golden Draenite gives less intellect. To find the gem you want I suggest searching for the <Stats> part of the name - depending on what socket and stats you are looking for - and just use the quality selector on the AH UI to specify what amount of the desired stats you want (and how much gold you are willing to spend).
Below is an overview of the different gem names and stats parts you can find. I have only listed BoE gems that is uncommon or better.
Meta Gems
Gem Name: Earthstorm Diamond, Skyfire Diamond (both rare)
All meta gems have different stats combinations.
Red Gems
Gem Name: Living Ruby (rare), Blood Garnet (uncommon)
Stats:
- Bold = Strength
- Bright = Attack Power
- Delicate = Agility
- Flashing = Parry Rating
- Runed = Spell Damage
- Subtle = Dodge Rating
- Teardrop = Healing
Yellow Gems
Gem Name: Dawnstone (rare), Golden Draenite (uncommon)
Stats:
- Brilliant = Intellect
- Gleaming = Spell Critical Rating
- Rigid = Hit Rating
- Smooth = Critical Strike Rating
- Thick = Defense Rating
Blue Gems
Gem Name: Star of Elune (rare), Azure Moonstone (uncommon)
Stats:
- Lustrous = Mana per 5 second
- Solid = Stamina
- Sparkling = Spirit
- Stormy = Spell Penetration
Orange Gems (Fit Yellow and Red Sockets)
Gem Name: Noble Topaz (rare), Flame Spessarite (uncommon)
Stats:
- Glinting = Hit Rating and Agility
- Inscribed = Critical Strike and Strength
- Luminous = Healing Spells and Intellect
- Potent = Spell Critical and Spell Damage
Greem Gems (Fit Yellow and Blue Sockets)
Gem Name: Talasite (rare), Deep Peridot (uncommon)
Stats:
- Dazzling = Intellect and Mana per 5 seconds
- Enduring = Defense and Stamina
- Jagged = Critical Strike and Stamina
- Radiant = Spell Critical and Spell Penetration
Purple Gems (Fit Red and Blue Sockets)
Gem Name: Nightseye (rare), Shadow Draenite (uncommon)
Stats:
- Glowing = Spell Damage and Stamina
- Royal = Healing Spells and Mana per 5 seconds
- Shifting = Agility and Stamina
- Sovereign = Strength and Stamina
Prismatic Gems (Fit Red, Blue and Yellow Sockets)
Prismatic gems are a bit different, here it's the stats part that decides the quality. Prismatic gems add resistance to all magic schools.
Gem Name: Sphere
Stats:
- Void = +4 resist all (epic)
- Prismatic = +3 resist all (rare)
Information from
http://www.mmorpg-guides.org. Just to help people get their gems sorted out. It should be noted that if you're cheap (like me) then the benefit from a blue gem is very minor compared to the green gem. Unless you're stacking several solid gems, you won't see a noticable difference from downgrading due to costs to green gems and just replacing things when you get the funds.
Also, I STRONGLY suggest you socket all your items right away. At the very least buy some white gems from a vendor (1.8g each) and toss them in to get the most bang from your new gear. You can then slowly upgrade your gems to green or blue as you get more resources.
The fact that all the epic DPS hunter gems come out of the hardest heroics makes me sad.