Hi everybody ! MasterE is right, gems are quest items. And the only way to know how many you have is the moment you have to defeat the troll during the story line. ->Open Spoiler<- I guess you are at the quest "Meet the king", or before ? If I remember well, the moment when you need it is the quest "Fight the evil troll". - - - Updated - - - Hi again I got that from daily missions's reward : Epic chocolates. For the wiki.
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