There are 6 types of gems: PATK, PDEF, MATK, MDEF, HP, and Speed, and they correspond to these 6 stats.

1. Socket gems: you may socket gems on gears to increase their stats.

2. The number of sockets on each gear is determined by the gear’s level. As many as 4 sockets may be available.

3. You cannot socket more than one gem of a particular type on a gear.

4. Craft gems: you may use 3 gems of the same grade to craft one gem of a higher grade.

5. You can acquire gems from the Gem Shop or Cloudwinder.

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(Socket gems panel)

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(Craft gem panel)