You get the fire gem from the fire mages in the undeadportal.
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You can get Fire Gem as a drop item from Skeletal Fire Mages in /portalundead Note: You can only get this item during the "Fire Gem" quest. The quest is a daily quest, so you can only do this once a day.
type /join portalundead-2 and talk to girl in front of portal
swordhavenunderfire
it is in the lair.go to your map and find it!
By calling forth the power of the fire dragon