By Attribute:
a) There are 8 kinds of gems that enhance a single attribute.
i. Red gems: inlaid into weapons, they increase attack power.
ii. Blue gems: inlaid into clothing/armor, they increase defense power.
iii. Yellow gems: inlaid into necklaces, they increase command.
iv. Green Gems: inlaid into medals, they increase attack and defense, but only for PVP encounters.
v. Fuschia (purpleish-red) Gems: Inlaid into helms, they increase attack by a percentage.
vi. Purple Gems: Inlait into rings, they increase damage output (flat bonus).
vii.Sky Blue Gems: Equipped to cloaks, they add a flat bonus to damage reduction.
viii. Orange Gems: Equipped to boots, they increase total defense by a percentage.
b) There are 3 kinds of gems which enhance two different attributes.
i. Red gems: Increase hero attack power and critical hit chance.
ii. Blue gems: Increase hero defense power and block chance.
iii. Yellow gems: Increases the command attribute, and critical hit damage.
By Star Rating:
All gems have a star rating from 1-6, much like heroes. The higher the level, the greater the enhancements of the corresponding attribute(s).
By Level:
All gems are acquired at level 1. The higher the level, the greater the effects. You can use the _Gem Synthesis_ ability to increase your gems_ levels.
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Game Guide for Age Of Warring Empire