I've been looking for a possible combination for a Gemstone for months that I could do with the dragons I have! Thanks. Also, about your coin problem, what level are you on? If you're pretty low on the level scale, I'd suggest feeding/evolving your dragons for higher coin output. Hope that helps!
I just downloaded the games that the game wanted me to play that gave me gold bars and deleted the games after i got the gold.... then bought coins with the gold... Thanks for your response! Lmk if you have any other questions!!!
I realize this is an old topic but if you haven't bred a Gemstone yet, you would have better odds if you use Water and Forest. 9 dragons with that combo than Tree Frog and Water. That pairing gives 22 or 23 dragons.