That looks like Hook’s usual pendants to me. It’s just a side angle. The one on top (left) is the dagger. The other is the skull. I can see the eye socket and the teeth.
I agree. It’s a profile of a skull-and-bones pendant.
I don’t think it’s a vial of any sort, and I don’t think it holds any fairy dust. If Bae is floating (which I sort of doubt), then that magic may be from someone else.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy