Which means if your grandmother is who she says she is, she was wearing the diamond the day the Titanic sank.

7 seconds sound clip from the Titanic (1997) movie soundboard.

You can hear this line at 00:16:42 in the Blu-ray version of the movie.

Quote context

[...]

- Nathan Hockley, that's right. Pittsburgh steel tycoon.

- The claim was for a diamond necklace his son, Caledon, bought his fiancée. You. A week before he sailed on Titanic. And it was filed right after the sinking.

- So the diamond had to have gone down with the ship.

- You see the date?

- April 14, 1912.

- Which means if your grandmother is who she says she is, she was wearing the diamond the day the Titanic sank.

- And that makes you my new best friend.

- These are some of the things we recovered from your stateroom.

- This was mine. How extraordinary. And it looks the same as it did the last time I saw it.

- The reflection has changed a bit.

[...]