I've Split my Stretched Ear in Half and Want It Reconnected (photo)

You have 2 main options.  The cut end can be reattached and then once healed you can try to stretch it out again. This should be done slowly after it heals for at least 6 weeks. Worst case scenario is that it tears again.  Also you can have the ear completely repaired and start from the beginning.

Repairing earlobes is a very common procedure.  Most people have them repaired after the hole from piercing has stretched down and turned into a slit, or sometimes, even torn through.  Earlobes can also be repaired after stretching.  Usually, the remaining piece can be reattached and I generally advise leaving it alone for at least 2 months.  I would not recommend stretching it again, as the repaired tissue will be weaker than normal.  You could just place a smaller circle in it to fill it, without stretching it more.