You can get it by going to glaisaurus cave quest or copy this link
http://www.dfwiki.com/index.php/Fire_Gem
You have to use a Fire and Water Dragon
put a fire and grass dragon together
breed fire dragon and metal dragon and speed it with two gems
Breed the earth dragon with the fire dragon.
buy it for 150 gems or breed fire and plant
The fire gems can only be retrieved during the Christmas Event
Find all of the gems to save the dragon.
Cold left firefly right
soccer and cool fire, but you must spend five gems for the breeding boost.
I'm sorry to say, but you have to buy it for somewhere around 200 gems, I wish we could breed it with a fire and a cold Dragon.
dont care cause i cant find it
You can get in only in October. You can breed a Bone Dragon by a Fire and Earth Dragon. I have 2 Bone Dragons by that combination. You can buy a Bone Dragon for 25 gems.