Talk:Emerald Dragon/@comment-5017480-20120531213829/@comment-68.4.142.215-20120531215945

I think it might be Mud and Crystal. Because a pearl is made from a grain of sand that is inside the mouth of an oyster for 7 years. Sand is similar to earth and an oyster is a marine animal. The Earth-and-Water combo is a Mud dragon. And a Crystal might be an ingredient for all gemstone dragon. That is my theory.