I've noticed that Mary wears a gold necklace with small circular charm. Anyone know what it is?

It definitely looks like the charm has some sort of saint on it. I've gotten a good enough look at it to see exactly which saint, but it looks like a female, and I wouldn't be surprised if it was St. Mary.

Hmmm...don't know about it being a saint. She's not religious (that we know). I 'm thinking it's something her father gave her and she's kept it all these years.

No, she's not particularly religious (and Jinx doesn't seem to be either). But Mary has mentioned that she's Catholic (or at least was raised Catholic), and it sure does look like one of those saint medal necklaces. Maybe her father was religious and gave it to her.