It''s stunning and looks great on your hand! I think it looks big too.
I know what you mean about the convenience of Tiffany - we found the same thing when we were ering shopping, I was almost against getting it from there but the one I liked the most was there!
Cheers for you and your ring and your engagement. It''s gorgeous! The color looks so bright white in the photos. It''s lovely. Always nice to have a ring from Tiffany''s, even if that was not your main focus. It looks great on your hand.