Are you looking for the fastest breeding combo to hatch the Ruby Dragon? This July Gemstone dragon is probably my favority looking Gemstone, and below we've got all the details you'll need to breed it.
Breeding Pair: Chrome + Scorch
Breeding Time: 31 hours or 24 hours 48 min (with upgrade)
Availability: Month of July
Type: Gemstone
Price: 1,525 Gems (Too much - but man.. it's a beauty)