Angel: Season 1, Episode 3
In the Dark
Oz visits L.A. with a present for Angel from Buffy. It's the Gem of Amarra, a ring which has been a vampire myth for millennia. While wearing it, a vampire is immune to crosses, stakes, and can even walk in daylight. It isn't long before Spike arrives in town, searching for the ring. And he has no plans of leaving until he gets it.