Venomous
Honorary Master
Just pop the question, then go and chose the ring together. It's better that way. Hollywood started the buy the ring first nonsense. If the ring isn't to her taste, it will be hard for her to tell you that.
"If a man is alone in the forest, and he says something, and there's no woman there to disagree with him. Is he still wrong?"
It's best to have the ring at the same time.
If it is bought from non-franshise stores they generally resize on site so the it can be done in a short time.