What happens next?

Buffy carries out her plan

The next day in the school library:

"Okay, Anya," said Buffy as she walked in, still fully naked and holding a hammer. "The jig is up."

"What are you doing here?" said Anya. "You're still naked."

"Giles the librarian managed to convince the principal that I was suffering from a rare medical condition," said Buffy. "Giles can be very convincing when he wants to be. Just like you."

"What does that mean?"asked Anya.

"You know what it means," said Buffy. "You might have fooled me yesterday but today I know the truth. You're a vengeance demon."

Anya smiled. "If you really believed that, you wouldn't talk to me the way you're doing."

"I'm not afraid of you," said Buffy, snatching the funny-looking necklace from Anya's neck. "Without this, you have no power. In fact, once this is destroyed, this curse you placed on me will be no more."

"You can't destroy that," said Anya. "That's a priceless family heirloom."

"Just watch me," said Buffy.

And with that, she proceeded to use her hammer to smash every single stone in the necklace until there was nothing left of it save a circle of string and a large pile of dust.