Heh. I'm totally willing to believe the necklace is a God EMF, whereas the Dean is Michael's sword thing REEKED of bullshit to me. Possibly because Cas said the former and Zachariah said the latter, and I think Cas is awesome and that Zachariah's a douchey liar. ;-)

But while I think Cas is a sneaky angel who's not beyond pulling a fast one, I don't really see the point of him lying about this. I could be wrong, though.