Later on, collars become elaborate affairs with complicated twists and beads. Still no earrings yet, but Brooches and Rings have not disappeared. However, avoid facted stones in anything. They were not in use until much later on. Now we have all sorts of jewelry to chose from.
Pearls are the key.
Pearls are the most commonly used gem during this time. Earrings make an appearance early in the 16th century, particularly in Italy, where they are most often plain drop pearls with simple matching pearl choker. A variation on the pearl earring is the pearl drop suspended from a ribbon that matches the wearer's dress. Earrings don't make an appearance in England until later in Elizabeth's reign, when the Italian style pearl drop becomes popular for both men and women. Venetian School ca.1565 Tudor Necklaces are wonderful affairs, with a choker and pendant, and a longer matching necklace which disappears into the bodice.