[Buffy shows up Sam's Christmas party wearing this. She's cheerful, happy to have someone she loves to spend the holiday with. It's also really nice to have a party to go to.
She's pleasantly surprised when Sam gives her his gift. It's not that she didn't expect him to have good taste, or that she didn't realize gifts were being given (she's got one for him), it's just that the necklace is beautiful and different from anything else she has.]
I love it.
[Her words are sincere and it's clear from the adoring look on her face that she means it.]