First, you're better off selling the holster separately. Selling it along with the pistol pretty much means tossing it in for free.
The jeweled hammer and trigger add zero to the value.... in fact, to a Ruger collector, actually reduce the value, since that ain't the way it came from the factory.
Is there a turn line on the cylinder? A 3-screw should NOT have a turn line. Other than that, if it has muzzle wear from the holster, it almost certainly has bluing loss on the front edge of the cylinder as well, and likely a bit of wear where the barrel joins the frame.
The big question, though..... has it been converted, and if it has, do you have the original lockwork?
Long story short.... if it's not converted, it's $400 tops... $300 to $350 is more likely. But that's without looking at it.
If it's converted and you don't have the parts, knock off $100 to $150.