Crystalline dragons are some of the hardest dragons to breed. I’ve been trying for Azurite since the middle of May, and haven’t gotten anything yet. Even if both dragons are level 14, there is still a chance that even after dozens of tries, you don’t get it. Also, I’m fairly sure order of the dragons doesn’t matter, and there isn’t certain levels that are way better than others. Breeding two level eleven dragons might get someone the dragon first try, while it could take fifty tries for someone else. Generally the higher the level, the better the chances.