Rose: Blanche, I thought you were in bed.
Blanche: Oh, I couldn't sleep. It must be from living with old people. I've been going through my diaries. Just listen to this. "March 3, 1967. George just back from Dallas. Surprised me with the most beautiful diamond earrings. I love him so much it takes my breath away. Ours is a love so pure, so complete, it'll outlast time itself.
I'll have the earrings appraised next week." See? That proves it.
Dorothy: Am I missing something?
Rose: Proves what?
Blanche: Dallas. Diamond earrings. George was obviously feeling guilty about cheating on me with David's mother. David was telling the truth.