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These Colt revolvers are HIGH DOLLAR guns theses days, and the mechanism is very complicated.
Even most gunsmiths are NOT qualified to work on them, due to the very complicated Colt action.
I strongly recommend sending the gun in to Colt for a proper repair.
The Colt Diamondback is simply too valuable to risk further damage by letting an unqualified Non-Colt gunsmith to work on it.
As to why the cylinder is stuck shut, this is something that's just not possible to diagnose over the internet.
My advice is to NOT start hammering on it trying to get it open or taking any internet advise about squirting something in it trying to get it open.
Send it in to Colt.
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