It came in a box.
A small box.
It was shiny.
And circular.
But it wasn't an engagement ring.
Rose pondered the delicate diamond and the gold band that perched on her left ring finger. It wasn't a wedding ring. It wasn't even a promise ring.
It was a "we might as well be married, but we really can't be because I'm, well, y'know, an alien Time Lord, but I love you so much I want to give you an engagement ring" ring.
It was really sweet.
And so cute.
Rose loved her Doctor.
And that was why this would never work.