Continuity mistake: Barbossa rips the chain and medallion off Elizabeth's neck, puts it into her palm, then cuts her hand. He takes her hand in his and he turns hers over so it's palm down. The chain can be seen in the close-up and wide shot, dangling down between her fingers and the chain is NOT clasped shut. In the next close-up of the chain and medallion falling into the chest, the chain IS clasped shut.
Picture added by Super Grover
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