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Diamond will be unlikely to show up on an x-ray, but metal will. If you can see the post, the diamond is probably near by. If you can't see the post, the diamond could still be in the gizzard acting like a rock. If you want really want it back- you will either need to keep all poop from this chicken and wash and screen it indefinitely or go in and get the diamond- easiest way is to dispatch and open the gizzard. I would get the x-ray if possible to see if there is any evidence that the thing is still in there.
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Diamonds are transparent to X-rays. The gold will show up------that is if it hasn't been in the gizzard long. I always cut open the gizzard when I butcher my chickens, I've found many odd pieces of stones (Glacial rock remains from the soil) polished to a pretty hue. I once found a glass marble frosted-ground down to 1/3 the original size. Chances are, the diamond is still in the gizzard helping grind up grains.