I would recommend two places:
Eiseman Jewels at Northpark (they are family-owned and have been in the business for years - my grandmother got so much of her high-end pieces from Richard Eiseman, Sr)
Carter Malouf, a private jeweler. I grew up with Carter and he has exceptional taste.
Here is a spread on designer vintage wedding gowns in
D Magazine; Carter supplied the jewelry for the shoot.