Arcane Mage does not rely on crits like Fire Mage, instead, it provides steady DPS, and does not suffer from RNG like Fire, however, in end game fire will provide in most cases higher DPS.

Gems and Enchants for Arcane Mage Wotlk

Arcane Mage Enchants

Head

[Arcanum of Burning Mysteries] – Kirin Tor

Shoulders

[Greater Inscription of the Storm] – The Sons of Hodir

Cloak

[Enchant Cloak – Greater Speed] – Enchanting

Chest

[Enchant Chest – Powerful Stats] – Enchanting

Wrists

[Enchant Bracers – Superior Spellpower] – Enchanting

One Hand Weapon

[Enchant Weapon – Mighty Spellpower] – Enchanting

Two-Hand Weapon

[Enchant Staff – Greater Spellpower] – Enchanting

Hands

[Enchant Gloves – Exceptional Spellpower] – Enchanting

Waist

[Eternal Belt Buckle] – Blacksmithing

Legs

[Sanctified Spellthread] – Tailoring

Feet

[Enchant Boots – Tuskarr’s Vitality] – Enchanting

Arcane Mage Gems

Meta Gem

[Chaotic Skyflare Diamond] +21 Critical Strike Rating and 3% Increased Critical Damage

Requires 2 blue gems

Red

[Runed Cardinal Ruby] +23 Spell Power

Stats/Blue

[Purified Dreadstone] +12 Spell Power and +10 spirit

Orange

[Potent Ametrine] +12 Spell Power and +10 Critical Strike Rating

[Reckless Ametrine] +12 Spell Power and +10 Haste Rating

Notes

Gems and enchants should be picked depending on the stats needed. Example: If under hit cap gem and enchant until hit cap, following the stat priority. Orange is a good choice if the bonus is + Spell Power and relevant, otherwise stack Spell Power (red) after meeting the meta socket bonus. Professions bonus are always better than the listed enchants and gems.