A ruby is one of the Gems. It increases physical attack based on level. Note: Levels 1-3 can be turned into the equivalent Sapphire via Life Skills Alchemy.

Level Improvement

 1    +  13 physical attack
 2    +  23 physical attack
 3    +  43 physical attack
 4    +  90 physical attack
 5    + 150 physical attack
 6    + 280 physical attack

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