Whatever chemicals you had it in with brought out some of the metal the 14k is mixed with and the greenish part would be copper that is mixed in, I would take them to a jeweler to get them cleaned and polished. Let the jeweler know what chemicals they were in with. I had found a 14k chain that ended up being fake after I really got a good look at it and it changed to that colorization after trying to polish it up, plus I found some flaking that wasn't found until I put it under my digital microscope and it says 14k Italy. So a lot of fake stuff is out there.