GUEST: I brought a necklace that was given to my grandmother for her wedding.

She passed it on to me to wear my wedding day.

APPRAISER: It's a beautiful Cartier Art Deco platinum, diamond, and sapphire pendant.

You have over one-and-a-half carats of diamonds... GUEST: Wow.

APPRAISER: ...and over one carat of sapphires total weight there.

GUEST: Wow.

APPRAISER: And you have these great geometric square cut sapphires.

We sometimes call them emerald cuts.

GUEST: Mm-hmm.

APPRAISER: Beautiful platinum chain.

So it's stamped on the side "Cartier" here, and it's small.

You really do need a loupe to see it.

GUEST: Mm-hmm.

APPRAISER: And then on the opposite side, it has the numbering.

What I love about it is, it's almost a transitional piece.

This part, right here?

GUEST: Uh-huh.

APPRAISER: It's so geometric, right?

You have... GUEST: Yes.

APPRAISER: It's really a square.

A perfect square.

It's really that typical Art Deco period.

GUEST: Yeah.

Mm-hmm.

APPRAISER: But then here, it's a little bit softer.

GUEST: Mm-hmm.

APPRAISER: Because in jewelry making, there's really no hard stop, right?

Like, you start doing BelleÉpoque, then you stop, then you do Art Deco.

Now there's kind of a little bit of a blending.

You have the receipt... GUEST: Mm-hmm.

APPRAISER: ...from 19, May of 1929, right before the stock market crash.

What's great about this is, it closes, and then you have the date here, your relative's initials on the other side, and then my favorite, how it just pops open.

GUEST: Magic.

APPRAISER: Like an armoire, yeah.

GUEST: Yes.

I love that.

APPRAISER: Do you have any idea of the value of your piece?

GUEST: I had it appraised maybe ten years ago, and I'm thinking that she maybe said $1,500 to $3,000.

But the reason I didn't like it was, she just didn't look at the box, or this, or any of the other information that was with it, and didn't seem to see it as a whole package.

And to me, that's part of what makes it really special.

APPRAISER: I agree-- it's the whole package.

People collect just Cartier boxes.

GUEST: (chuckles) Oh, gee, I didn't know that.

APPRAISER: I would appraise your set, retail, at $15,000.

GUEST: Wow.

(laughing) Wow, I didn't expect that.

APPRAISER: Yeah, it's, it's really, really remarkable.

It was a beautiful gift.

GUEST: I wonder if that was kind of done that often for an engagement gift, 'cause I got, like, Crock-Pots and... (laughs) ...things like that.

(both laugh) APPRAISER: Well, I guess it depends on your relative, right?

GUEST (laughing): Yeah.