Who gave her the necklace?
Green gem that size has gotta come from the Emerald City, I reckon. Whether she took it or was given it, who knows.
Maybe the Wizard gave it to her….as in Rumplestiltksin.
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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