Congratulations on your proposal.
I understand that you know that Antwerp is the world's diamond capital, and that you want to come over here to get the best deal possible.
Well, to start, I would not come over on a Saturday. The real diamond center is not working on that day.
In the surroundings of the diamond center, you do have a high number of shops, but they are not a part of the real diamond center. They might be giving you a good service, and the price might be somewhat lower than the price in any other European jewelry store, but you will not get the great deal that I think you are looking for.
On the other hand, the real diamond center is entirely targeted at professional buyers, and the chance of you entering unprepared and getting a great deal (not to talk about service) is rather slim.
If you want to know more, please feel free to ask. Right now, I will leave it at this.
Live long,
Paul