On Brooke: Zac Posen red satin gown, $2,790. Barneys New York. 18-karat white-gold necklace with 11.93 carats of round brilliant diamonds. 18-karat white-gold formal earrings containing 15.5 carats of diamonds. Molina Fine Jewelers. On Jeanne: Hervé Léger fuchsia bandage dress, $1,700. Saks Fifth Avenue. 18-karat white-gold diamond hearts necklace containing 14.46 carats of round, half-moon and princess-cut diamonds. The Jewelry Boutique at Molina.