Final answer:
Breeding a gem dragon in DragonVale involves pairing two dragons of different elements. The desired gem dragon and the dragons needed for breeding differ, and successful breeding relies on the dragons' levels and elements.
Step-by-step explanation:
In the game DragonVale, the breeding of a gem dragon involves pairing two dragons which have different elements, depending on the specific gem dragon you're trying to breed.
For example, to breed a Ruby Dragon, one would need to pair a Chrome and Scorch Dragon. The process involves using the Breeding Cave or Epic Breeding Island, where these dragons should be positioned. Remember that the success of breeding a gem dragon depends on the level of your dragons, their elements, and sometimes luck.
Learn more about DragonVale Gem Dragon Breeding