Possibly Maggie's Engagement ring?
That's the working theory.
Looks like A baby face but would they do that. I thought he only bashed the head
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I don't believe it's bone fragments in the screenshot, but considering they shot one little girl in the head ("look at the flowers Lizzie…") and Negan most likely beat a pregnant woman to death, I don't think killing a baby is off the table, especially if it's a zombie baby.