I think your bag is beautiful!! I didn't like it at first from just looking at the pictures before the new MC bags came out, but I saw one IRL a couple of days ago and it is truly gorgeous. I think you ought to keep it since your DH bought it for you.
As for the buckle --- it would probably scratch over time, but that doesn't detract from the beauty of the bag, IMO. I wouldn't worry too much about it. I am waiting for my white MC Ursula and it also has a similar buckle.
Enjoy your new bag!