The Orbital is a piercing which enters and exits through the same area of cartilage at the top of the ear.
This piercing is sometimes more successful when made as two initial piercings, with separate jewellery; but with careful planning one piece of jewellery can later be fitted into both healed holes.
If one piece is used for the initial piercing, then a Ball Closure Ring or PTFE barbell are good choices.
Ear cartilage piercings generally take longer to heal than lobe piercings.
This is often due to a combination of things, such as the location of the piercing in the cartilage, the type of jewellery used and the tension that jewellery creates to the structure of the cartilage.
Using biocompatible plastics (like PTFE), cleaning cartilage regularly, and increasing your intake of minerals will certainly benefit your piercing; however a piercing will almost always be doomed to failure if improper jewellery and poor planning are used and left unmonitored.