With just a bit of thought, almost anything is possible when it comes to editing an image with Photoshop. In this case, the solution was very simple.
First you needed to eliminate the medallion. There was enough 'negative' space above it to copy a section > move the copy down > merge, then do some
cloning to clean it up. Second draw a rectangular marque around the earring. Then copy, paste and flip horizontally and move over...merge and clean up.
Now you have what you want, except in this case the new earring is wrong reading. Luckily, it's symetrical, so I simply took the pen tool, traced a path around
the oval copied it pasted it and flipped it. Then I turned off the layer, did some cloning to clean up the area adjacent to the oval ( on the base layer ) then selected
the copy and positioned it and merged. Done deal.
Now in order to separate you from some other PS practitioners you may want to take this to the next step and do some work on the highlights. They are coming from different directions
If you want help with that, let us know