Earring Size Information
Earrings come in different thicknesses. The most common size is 0.8 mm (20GA), but 0.6 mm (22GA) is also a popular fitting. Some earrings can even go up to 1.0 mm (18GA).
If you consistently wear earrings and change them regularly, you can most likely wear any thickness up to 1.0 mm. This is especially true when your hole has been fully healed for years. At this point, there isn't much that can go wrong. Just make sure not to purchase piercings starting at 1.2 mm (16GA) for your normal earring hole.
If you are not sure if you can wear the thicker earrings, simply stick to 0.6 mm or 0.8 mm.