The sapphire dragon is a limited edition gemstone dragon. It is only available in the month of September. You cannot breed gemstone dragons together to make other gemstone dragons, and they must live on the gemstone island. They produce gems instead of coins. You can get a maximum of one gem a week per gemstone dragon.
Some successful combinations for breeding are:
Mountain + Rain (most successful at 12%)
Steel + Storm
Mountain + Water
Mud + Evergreen
Bloom + Crystal
You don't breed a Kairos Dragon in DragonVale. You have to get parts to complete it.
you breed a ice dragon with a mine dragon
You have to breed a plant and a fire dragon.
As of July 2012, there has not been a star dragon in DragonVale.
You have to breed a sun and moon dragon together
You have to breed a metal and a water dragon together.
You have to breed a plasma dragon with a salamander dragon.
Breed the earth dragon with the fire dragon.
To get a Smoke Dragon, breed a fire and air dragon together.
There is no "marsh" dragon in dragonvale but if you are referring to the moss dragon the best way to get it is earth and plant, although you also have a chance to breed the tree dragon.
Yes, all of the gem dragons can be bred without the epic breeding island.
Earth Dragon and Cold Dragon