What is the Evenstar necklace?
In Peter Jackson's Lord of the Rings, Arwen gives a jewel to Aragorn: the Evenstar necklace:
Where did this jewel come from? Does it have any special powers or meaning?
I seem to recall Glorfindel leaving some sort of (green?) gem somewhere, as a sign, which someone finds, I seem to recall it was Aragorn. Since Arwen "replaced" Glorfindel in the movie, perhaps it is some vague reference?
I don't think there is any special meaning to the necklace. It was invented for the movie and is never mentioned in the book. Arwen does give a necklace to Frodo after the war is over, but it is not referred to as "the Evenstar necklace" or anything else close.
I think the necklace accomplished the dual purpose of a set piece that helps to tell a story while also being a marketable piece of jewelry.