There are several types of gems in the game:

  • those what are part of the dungeon puzzles, and you have to use them to open doors, by inserting them into empty eye-sockets in reliefs on walls
  • those what you can add to sockets to your items to give bonuses, like critcal chance, etc
  • and that blue gem which is a currency that can be used to buy stuff, for example inventory or storage spaces, and it costs real money, so by purchasing it, you can support the developer
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