True @gm89uk. I know you had the opposite opinion of me, which I respect. This is why I'm curious to know what the OP thought. Sounds like they did a blind test.
We did notice a size difference, but it was such a different colour that it ruled the G straight out for us (appreciate that this was when they were next to each other - we may not have been able to tell either size or colour difference if we'd viewed separately!).
We're getting it put on to a ring at the moment, and so will post a picture once we've got it mounted.