One piece is the best choice when the outfit already has a clear center or repeated detail. Wear the drop earrings with a button front shirt, a centered brooch, or a neckline that supplies its own structure. Wear the bracelet alone when your upper half includes a scarf or collar and the wrist needs one quiet echo of polish.
Two pieces often give the easiest Classic result. Earrings plus bracelet distribute the pearl accents from face to wrist without filling the neckline. Necklace plus bracelet create a measured vertical repeat when earrings are unnecessary or when another small earring is already part of your routine. Necklace plus earrings place the focus near the face, which works best when the wrist and sleeves stay simple.
All three pieces make sense when the clothing is restrained enough to hold the full repetition. Try a clear neckline, a simple sleeve, and minimal extra jewelry. Then step back from the mirror. You should notice an ordered whole before noticing that every piece matches. If the set becomes the first and only message, remove the bracelet or necklace and check again.