In DragonVale for the Android and iOS systems (iPhone and iPad, etc.), the Ruby Dragon is the third Gemstone Dragon introduced to the game, representing the month of July. Being a Gemstone dragon, it earns gems instead of gold.
The Ruby Dragon has a base breeding time of 31 hours, sells for 1,500,000 gold, and earns 100,000 XP upon successful breeding at level 17.
To get a Ruby Dragon, you need to breed a Chrome Dragon with a Scorch Dragon during the month of July.
Check out my DragonVale Breeding Guide for more dragon breeding combinations, as well as the combinations you’ll need to make the necessary dragons for the Ruby Dragon, and other Gemstone Dragons.