Ive bred my mountain dragon with my rain dragon at least 10 times now and still havent gotten a sapphire dragon. Both are at level 10 and Im on level 20. How long is it going to take and what am I doing wrong??
As pointed out on the Gemstone Dragons wiki entry, all gemstone dragons have a very low chance of being bred. Breeding them on the epic breeding isle improves those odds slightly but ten failures is well within the expected bounds.
(Some math: Even if the chance for a gemstone is as high as 10% -- and while I don't know the actual percentage I expect it's even lower your chance of missing ten times in ten shots would be 35%, give or take. If it's 5%, that chance would increase to 60%.)