Board Thread:Dragon City Gameplay Questions & Answers/@comment-78.96.220.127-20130628100335/@comment-11260834-20130628101400

Some times that happens when we are trying to make a pure elemental dragon, once when i breeded  Water+Pure  it came Petroleum Dragon! (luck ha?)

So, try to use the 5 gems boost to get a pure elemental dragon next time, good luck!