I think the locket Mary’s wearing is the same one Hyde’s holding in the set photos, (then it’s in Rumple’s hand, then Hyde has it again in Gold’s shop. The ribbon is this really distinctive looking gauzy material, so I’m going to assume that the pendant is the same.
I’m working under the assumption that Jekyll/Hyde lost Mary once he began to experiment on himself and transition between Hyde and Jekyll. Perhaps he even kills her in some sort of fit of rage.
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"He was a lot of things to me" "The only conclusion was love"