Exquisite details give life to the simplest of silhouettes. Romona Keveza silk shantung taffeta strapless mermaid gown accented with voulant couture ruffles, $7,200 at Bijou Bridal, Ardmore. White-gold and diamond twisted hoop earrings, $7,025, white-gold and diamond bracelet, $6,995, and platinum and diamond Contour engagement ring, $26,300, all at Diana Vincent, Washington Crossing.