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Hi. Welcome to Just Answer. My name is***** (I'm actually here!). Do you feel that he's in any distress or acting any different at this time?
Great! Did he or didn't he eat is necklace chain. Honestly, the best way to figure this out is to have your vet take a quick x-ray of him as the metal in the necklace will show up easily as to if it is there or not. Cats can eat thread, strings, and other long things like the necklace so it isn't out of the question. There is really no way to know if it is in him without that x-ray.
If the necklace is there, could it pass? That depends on the length. Fingers crossed it isn't inside of him as that takes all worries out of the question.
I can understand that. Did he do this thing that seems like something that just shouldn't happen? Until you get him x-rayed, just let him be normal and do his normal things. Let's see what the film shows. If it was a piece missing less than a few inches, that wouldn't be that worrisome.
14 inches is getting up there. In linear foreign body situations, the length is the more concerning issue. How thick or thin it is, really doesn't matter most of the time. I would definitely get him to your vet first thing for an x-ray to reveal what is going on.