Dress watches for women are very much back in style, taking their cue from sport watches and mixing diamonds and straps for an easy elegance that suits both business and formal wear. "People are buying diamond watches for both day and evening," says Leon Adams, president of Cellini jewelry store. And there is a trend toward "watch wardrobing," says industry advisor Anthony J. D'Ambrosio: "The average successful person owns three to four quality watches, each representing a different aspect of their lives." For that special occasion, clockwise from top: Chopard's Ice Cube Maxi in 18-karat gold on satin strap ($8,300; 800-246-7273); Audemars Piguet's Charleston with an Art Deco-inspired diamond case on leather strap ($14,600; 888-214-6858); Jaeger-LeCoultre's 18-karat gold and diamond Reverso Duetto on crocodile strap ($7,850; 800-552-8463); Rolex's Cellini Cellissima in 18-karat white gold with diamonds on crocodile strap ($10,300; 800-367-6539); Chaumet's Khesis bracelet watch in 18-karat gold ($8,600; 800-321-4832); Patek Philippe's Gondolo in 18-karat gold with diamonds on crocodile strap ($9,600; 800-526-0649).