Fellow wiccans please help, how do I tell if it's cursed?

A self proclaimed wiccan gave me a necklace, we do not get along so I was taken by surprise when she handed it to me, I am wondering how to tell if she did place a curse on it or a charm or spell, I am wiccan but my expertise lays more in the energy fields and spiritual world, thank you for any answers, Blessed Be!
Update: it's beaded, metal beads, i feel uneasy with the energy but I wish to know what her motives were, it's black magick so she'll already get it back but I'm curious to what it's cursed with
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