OK, it's a digestion question. You can read what happened on my blog (below). Will it pass?
Here is a link that might be useful: The girl without a pearl earring
I think it will pass eventually in the feces, for the chickens sake.
Imagine cracking an egg open to find apearl...kinda like a clamshell? lol.
Hope you find your pearl.
Being a chicken lady myself, I got a chuckle out of it and thought how typical. I found out really quickly never to wear open-toe sandals into a hen house. A hundred hens going for the pink toenails in unison is exquisitely painful with they tiny, sharp beaks.
In a serious vein, if a pearl ever did go through a crop and gut, it won't come out looking like it did going in, since the nacre is fragile and sort of organic. It's be like putting a (cover your hen's ears) chicken bone in a cup of vinegar.
I have had parrots try to pull the diamond out of my rings and from my ears too. Birds love flashy stuff. Cute blog.