Gems

Gems are used to socket into high level gear to add special effects and bonuses. They can be synthesized or combined by pressing "Shift" and right clicking on them. This will take 4 gems of one level and produce a single gem of the next level. In the "convert gem" tab you can also re-roll the color of a gem for a small fee. Only the color will be changed, the level will remain the same.

When socketed into a piece of gear, each gem will grant 1 of 4 random stats. If you are unhappy with the result, you can remove the gem (level 4 gems begin requiring black gold to remove), and try again. The stats can be found below:

Red Gems - Physical Attack
 * Armor
 * Physical Power
 * Agility
 * Strength

Blue Gems - Magic Attack
 * Spirit
 * Intelligence
 * Spell Power
 * Magic Resist

Green Gems - Defense
 * Critical Resist
 * Health
 * Magic Resist
 * Armor

Purple Gems - Element Gems
 * Constitution
 * Critical Damage
 * Critical Power
 * Toughness

Yellow Gems - Critical Gems
 * Dodge
 * Armor Penetration
 * Precision
 * Critical Hit Chance