This 2da contains the effects of the all the game's gems. Note that the in-game appearance - icon, price, etc. - is featured in items.2da 
Most Common Effects
Many effects are possible in this 2da, but the following are used most often:
| effect | meaning |
|---|---|
| 37 | modifies health base |
| 38 | modifies chi base |
| 39 | modifies focus base |
| 17 | modifies intimidation skill |
| 18 | modifies intuition skill |
| 19 | modifies charm skill |
The Columns of gems.2da
| column name | meaning |
|---|---|
| Label | internal name of the gem |
| Level | (unused) |
| CombatOnly | possible values:
|
| UpgradeCost | (unused) |
| Upgrade | (unused) |
| EffectX | effect(s) of this gem; references rows in effects.2da
|
| ParameterX | additional parameter for EffectX; in case of a gem that increases the PCs Focus e.g., this column would contain the amount of that increase |
| DurationX | (probably unused; all gem effects are permanent) |
| UniqueSet | if a gem has a number other than 0 here, it belongs to a unique set; only a single gem of a unique set may be equipped by the player at any given time. |
| MinAlignment | the minimum alignment that is required to equip this gem; used to restrict gems to Open Palm characters (completely Closed Fist characters have an alignment of 0) |
| MaxAlignment | the maximum alignment that is required to equip this gem; used to restrict gems to Closed Fist characters (completely Open Palm characters have an alignment of 255) |
| AlignmentSRTREF | when the player tries to equip a gem for which he or she doesn't have the required alignment a dialog with this message pops up and the equipment is cancelled; references an entry in the dialog.tlk |