Dark Cloud gems are in-game items that improve the power of weapons. When players attach the various gems to weapons in the game of Dark Cloud, the gems give specific attributes to the weapons.
Gems are acquired in the game by checking treasure chests in the back rooms of dungeons, fishing for points or purchasing the gems in the last dungeon. The gems appear at random in treasure chests, so it's not possible to find a specific chest for each gem. To get the gems by fishing, it is necessary to get 100 points, which can be spent on a gem. The price for gems in the last dungeon is 3,000 Gilda, which is the in-game unit used for money.