Stages of the Moon – Film Negative Transluscent Resin Bangle. From the Etsy store of Bethastic here. More photos of this bracelet in her gallery. Beth writes:

This project took forever (for obvious reasons) As of right now, I have one bangle, ready to ship! What a great conversation piece. You can see the craters as well as the the black sky with stars. Looks great on. Your skin can also be seen through this, as you can see in the photo where I have my finger pressed behind it. 

Her bangles (and I believe all resin work – but I could be wrong) are so unique that they are copyrighted and patented.