put diamond and air for the first time and get gold, was going for something else, about 20 more hrs before it hatches from the egg.
The best way to get a diamond as far as I know is Fireworks or mirage with rainbow, because there are no rainbow hybrids.
Just got Gold Diamond Dragon with Diamond Dragon level 10 and Air Dragon level 10 it took 4 and half day's for me to breed it. For those who don't have it just keep breeding it over and over.
My first breeding attempt with Diamond and Kaleido gave me Gold Dragon. I was very pleasantly surprised!
Just hatched my 4th Gold dragon.. this one was a fail from Atlas n Diamond :/ Little newly hatched Golds are adorable