How do you breed a gummy dragon in DragonVale?

The most effective method of breeding a crystal dragon is by using an air dragon (lv 10 left) and a quake dragon (lv 10 right). This has about a 40% success rate.

The crystal dragon will be in a yellow egg with a white diamond pattern. It will take 24 hours to breed, and another 24 hours to hatch. It is unlocked for breeding at player level 11. It gives 10,000 experience points at hatching.

Other methods of breeding include:

• Mud (lv 10 left) + Storm (lv 10 right)
• Quake (lv 10 left) + Ice (lv 10 right)
• Love (lv 10 left) + Panlong (lv 10 right)
• Earth (lv 10 left) + Lightning (lv 10 right)
• Sonic (lv 10 left) + Earth (lv 10 right)