Babylon 5, Season 4: No Surrender, No Retreat

[Sheridan proposes to Delenn]

John Sheridan:
I, um…I wanted you to have this. I got it down in the Zocalo. It's not exactly what I had in mind, but, um…It's temporary until I can get you a real engagement ring. Um, it's an Earth custom. See, you give someone you love an engagement ring as kind of down payment for another ring. The kind you exchange when you get married. I don't know when we will be able to get around to that part of it. We may not survive the next two weeks, but I wanted you to have this and to know that whatever time I have left, I want to spend it with you.