Day to day, most preppy men wear hardly any jewelry at all with the exception of a wedding ring, sometimes a single signet ring, and sometimes a watch.
CUFFLINKS - Paul Stuart and Thomas Pink
SIGNET RINGS - Dexter
STUDS - Mother-of-pearl goes nicely (and traditionally) with white-tie from Paul Stuart.
WATCHES - In New York visit Tourneau. and Wempe. Ronde Louis from Cartier, gold with alligator strap.