For a timeless look, build your jewelry collection to include these 7 all-time classics. Every woman should have these in her jewelry box! Diamond studs are small enough to be worn during the day, but also look beautiful with an elegant dress at night. A personalized ring is a sentimental piece that sets you apart. You could have your initials engraved in a ring, or simply wear your birthstone. Every girl needs a string of pearls. Read on as eBay outlines all 7 jewelry classics.