The Gem is one of the currencies in O2Jam.
Gems can be earned just by playing songs. However, when the O2Jam player reaches level 10, he can no longer earn gems through Single rooms. Players can get neither Gems nor EXP through Couple rooms. A limited number of items and songs can be bought using Gems.
Computation of Gems earned (shown below as ΔGem) in O2Jam after playing a song is
where is the player level and is the completion percentage of the song.
- e-Points/EXP/OPM songs/Scoring/Gems - O2Jam FAQ IP e-Games Community Forums (Philippines). Retrieved on March 2, 2008.