GUEST: This is my grandmother's ring.

And she gave it to me in her will when she passed.

And I don't know anything about it other than it's got a really big blue stone that I think is a lapis lazuli.

So I wore it on my wedding day as my something blue.

She was born around 1919, I think, and she worked on the New York Stock Exchange in the 1940s.

And her mother-in-law was someone who worked with diamonds in New York City.

Uh, so my great-grandmother might have had this ring and given it to my grandmother.

APPRAISER: It's an Art Deco ring and it's going to be made, I'm thinking around 1925.

Inside the shank-- it's this platinum shank-- it's a very obliterated mark.

And I said, "What is that saying?"

So I took the ten-power loupe and I looked and I looked and it says "Y and Co." Tiff...

GUEST: Tiffany and Company!

APPRAISER: Company, you got it, GUEST: Oh!

APPRAISER: Yep, yep.

It's Tiffany and Company.

GUEST: Oh, my goodness!

APPRAISER: I know, I know, I was so excited I got chills.

So-- GUEST: I knew that it had a little bit of writing... APPRAISER: Yeah.

GUEST: ...but I could never read it.

I didn't know what it said.

APPRAISER: It's-it's there.

It's-it's slightly obliterated, so it's going to be hard for me to show it, but that's, yeah.

GUEST: (laughs) Wow!

APPRAISER: So it would be Tiffany & Co. New York.

Intrinsically, we have not really valuable things.

We have a lapis lazuli, as you know, and that's a sugarloaf cabochon.

Sugarloaf cabochon is a really high cabochon that was really popular in the Art Deco period in the 1920s.

GUEST: Yeah.

APPRAISER: And on the side is chrysoprase, which is not jade.

GUEST: Oh, okay.

APPRAISER: So, chrysoprase was also used in Art Deco jewelry, and it was used, really, just as accent stones.

It's also set with some tiny rose-cut diamonds.

Do you have any idea on the value?

GUEST: I thought it was platinum.

APPRAISER: Yeah.

GUEST: And I thought the diamonds might be real, so I thought maybe a few thousand, but I don't... APPRAISER: Yeah, well, it's well worth that.

GUEST: Okay.

APPRAISER: Um, I would say $5,000 to $7,000 auction estimate.

GUEST: Wow, that's amazing!

APPRAISER: So for insurance it would be right around $8,000.

GUEST: (exhales) Wow.