I bet you are looking for the fastest breeding combo to hatch an Opal Dragon. Well it so happens we here at WOTS have just that information. The fastest and only combination to breed the October Gemstone dragon is described below. Back for a limited time with the "Bring 'Em Back" event - so breed, breed, breed!
Breeding Pair: Lava + Mud
Breeding Time: 31 hours or 24 hours 48 min (with upgrade)
Availability: Back till Jan 2nd
Type: Gemstone
Price: 1,475 Gems (For that freaky looking thing?)
Well there is unique good, and unique bad. I'm not sure this thing is hideous, but it would give you a wicked scare if you weren't expecting it - that's for sure.