While I do possess much knowledge about the owlbeasts you defeated in Winterspring, I am not very learned on the subject of the magics they wield. But I do believe I know of one that would be able to examine the necklace and most likely tell you what it is.
Nara Wildmane in Thunder Bluff is an expert in this field; see her. Good luck, <name>.
The energy of this necklace, <name>. I believe that it has only one source.
The wildkin, now misguided and confused, were once not so. They once had a purpose, and were guided to serve. The night elf goddess Elune created these creatures to guard her most sacred areas.
While this fact may seem like it holds little value; I urge you to look deeper.
You will learn, in time. Thank you for bringing this to me, <name>.