Personally, I think Blair's style is a bit uptight, but I adore this Tiffany & Co Fleur De Lis key. I think it would look better paired with another, shorter necklace or against a more boho outfit. The diamonds and the Diane Von Furstenberg top is all a bit (as they say) "matchy-matchy" for my liking.
Buy from Tiffany & Co for US$2,500. (Chain sold separately)