Bonuses for spell penetration can be found on blue, green, and purple gems, but the [Mysterious Fire Opal] currently provides penetration as well. This is believed to have been an error in its itemization, but Blizzard has thus far made no mention of fixing it, which makes it a valuable gem for filling yellow sockets in PvP gear for DoT-based casters (who do not typically care about spell crit and may prefer spell penetration to intellect).
| Color | Name | Effect(s) | |
|---|---|---|---|
 Blue
|
[Stormy Azure Moonstone] | +8 Spell Penetration | |
| [Stormy Star of Elune] | +10 Spell Penetration | ||
| [Stormy Empyrean Sapphire] | +13 Spell Penetration | ||
| [Stormy Chalcedony] | +15 Spell Penetration | ||
| [Perfect Stormy Chalcedony] | +18 Spell Penetration | ||
| [Stormy Sky Sapphire] | +20 Spell Penetration | ||
| [Stormy Majestic Zircon] | +25 Spell Penetration | ||
 Green
|
[Radiant Deep Peridot] | +4 Spell Penetration | +3 Critical Strike |
| [Radiant Talasite] | +5 Spell Penetration | +4 Critical Strike | |
| [Radiant Chrysoprase] | +5 Spell Penetration | +5 Critical Strike | |
| [Radiant Seaspray Emerald] | +6 Spell Penetration | +5 Critical Strike | |
| [Radiant Dark Jade] | +8 Spell Penetration | +6 Critical Strike | |
| [Shattered Dark Jade] | +8 Spell Penetration | +6 Haste | |
| [Tense Dark Jade] | +8 Spell Penetration | +6 Hit | |
| [Perfect Radiant Dark Jade] | +9 Spell Penetration | +7 Critical Strike | |
| [Perfect Shattered Dark Jade] | +9 Spell Penetration | +7 Haste | |
| [Perfect Tense Dark Jade] | +9 Spell Penetration | +7 Hit | |
| [Radiant Forest Emerald] | +10 Spell Penetration | +8 Critical Strike | |
| [Shattered Forest Emerald] | +10 Spell Penetration | +8 Haste | |
| [Tense Forest Emerald] | +10 Spell Penetration | +8 Hit | |
| [Radiant Eye of Zul] | +13 Spell Penetration | +10 Critical Strike | |
| [Shattered Eye of Zul] | +13 Spell Penetration | +10 Haste | |
| [Tense Eye of Zul] | +13 Spell Penetration | +10 Hit | |
 Orange
|
[Mysterious Fire Opal] | +5 Spell Penetration | +6 Spell Power |
 Prismatic
|
[Stormy Dragon's Eye] | +43 Spell Penetration | |
| Purple
|
[Mysterious Shadow Crystal] | +8 Spell Penetration | +7 Spell Power |
| [Perfect Mysterious Shadow Crystal] | +9 Spell Penetration | +8 Spell Power | |
| [Mysterious Twilight Opal] | +10 Spell Penetration | +9 Spell Power | |
| [Mysterious Dreadstone] | +13 Spell Penetration | +12 Spell Power | |