Parry gems are red gems, orange gems, purple gems, and prismatic gems.

Cataclysm Mists of Pandaria Gems
Color Name Effect(s)
UI-EmptySocket-Red.png Red  [Flashing Serpent's Eye] +20 Parry
 [Flashing Primordial Ruby] +20 Parry
 [Flashing Pandarian Garnet] +16 Parry
UI-EmptySocket-Red.pngUI-EmptySocket-Yellow.png Orange  [Fine Vermilion Onyx] +10 Parry +10 Mastery
 [Splendid Vermilion Onyx] +10 Parry +5 PvP Resilience
 [Stalwart Vermilion Onyx] +10 Parry +10 Dodge
 [Fine Tiger Opal] +8 Parry +8 Mastery
 [Splendid Tiger Opal] +8 Parry +8 PvP Resilience
 [Stalwart Tiger Opal] +8 Parry +4 Dodge
UI-EmptySocket-Red.pngUI-EmptySocket-Blue.png Purple  [Defender's Imperial Amethyst] +10 Parry +8 Stamina
 [Retaliating Imperial Amethyst] +10 Parry +10 Critical Strike
 [Defender's Roguestone] +8 Parry +8 Stamina
 [Retaliating Roguestone] +8 Parry +6 Critical Strike
UI-EmptySocket-Cogwheel.png Cogwheel  [Flashing Tinker's Gear] +38 Parry
Cataclysm Cataclysm Gems
Color Name Effect(s)
UI-EmptySocket-Red.png Red  [Flashing Queen's Garnet] +20 Parry
 [Flashing Chimera's Eye] +16 Parry
 [Flashing Inferno Ruby] +16 Parry
 [Flashing Carnelian] +12 Parry
UI-EmptySocket-Red.pngUI-EmptySocket-Yellow.png Orange  [Fine Lava Coral] +10 Parry +10 Mastery
 [Stalwart Lava Coral] +10 Parry +10 Dodge
 [Splendid Lava Coral] +10 Parry +5 PvP Resilience
 [Fine Ember Topaz] +8 Parry +8 Mastery
 [Fine Hessonite] +6 Parry +6 Mastery
UI-EmptySocket-Red.pngUI-EmptySocket-Blue.png Purple  [Defender's Shadow Spinel] +10 Parry +8 Stamina
 [Retaliating Shadow Spinel] +10 Parry +10 Critical Strike
 [Defender's Demonseye] +8 Parry +4 Stamina
 [Retaliating Demonseye] +8 Parry +8 Critical Strike
 [Defender's Nightstone] +6 Parry +5 Stamina
 [Retaliating Nightstone] +6 Parry +6 Critical Strike
Wrath of the Lich King Northrend Gems
Color Name Effect(s)
UI-EmptySocket-Red.png Red  [Flashing Dragon's Eye] +20 Parry
 [Flashing Cardinal Ruby] +20 Parry
 [Flashing Scarlet Ruby] +16 Parry
 [Flashing Bloodstone] +12 Parry
UI-EmptySocket-Red.pngUI-EmptySocket-Yellow.png Orange  [Stalwart Ametrine] +10 Parry +10 Dodge
 [Stalwart Monarch Topaz] +8 Parry +8 Dodge
 [Stalwart Huge Citrine] +6 Parry +6 Dodge
UI-EmptySocket-Red.pngUI-EmptySocket-Blue.png Purple  [Defender's Dreadstone] +10 Parry +8 Stamina
 [Defender's Twilight Opal] +8 Parry +6 Stamina
 [Defender's Shadow Crystal] +6 Parry +5 Stamina
Bc icon.gif Outland gems
Color Name Effect(s)
UI-EmptySocket-Red.png Red  [Flashing Crimson Spinel] +20 Parry
 [Flashing Living Ruby] +16 Parry
UI-EmptySocket-Red.pngUI-EmptySocket-Yellow.png Orange  [Stalwart Fire Opal] +5 Parry +4 Dodge
 [Splendid Fire Opal] +5 Parry +4 PvP Resilience
UI-EmptySocket-Red.pngUI-EmptySocket-Blue.png Purple  [Defender's Tanzanite] +5 Parry +6 Stamina


Before Patch 3.2.0 in particular, parry gems were generally considered inferior to dodge gems or defense gems because of the amount of avoidance they give when taking into account diminishing returns. This still may be true after the patch was released, but it should be less so.

On July 13, 2009, Greg "Ghostcrawler" Street, the Lead Systems Designer posted about this very topic on the forums:

Re: Avoidance Change | 2009-07-13 21:28 | Blizzard Entertainment Ghostcrawler

Q u o t e:

However, as far as the dodge vs parry, you've got to consider that a lot of people think in absolutes. "Parry is not as good as dodge" turns into "NEVER GEM PARRY BECAUSE IT'S A GARBAGE STAT". I don't think it'll change their perceptions, but that's more of a problem with humanity.

Oh yes. At some point "Not BiS" became "trash." :)

It's not the end of the world if parry gems rot. But we want to be able to put parry on say rings without those just being sharded.

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Patch changes