Erik i am offshore right now so pictures are not possible,
however the steps are easy and well known the problem is most people do not want to spend the time required to make a good ring they are always looking for short cuts :-)
Step one mark the center of the coin
Step two drill or punch out a hole in the center of the coin
the Diameter of the hole should be less than 1/3 of the diameter of the coin.
Step three anneal the coin (heat it to a cherry red colour and drop it in coll water) this is important or your coin will split when you start to shape it.
Step four place the coin on a ring mandrel ( I prefer a stepped one not a tapered one)
http://jewelryinfoplace.com/wp-content/uploads/2015/01/ring_mandrel.jpgStep five with a nylon or preferably rawhide hammer gently work the coin so its folds flush with the ring mandrel.
Step six pickle the ring in acid and polish.
Generally i only make rings to order especially silver ones so this one is sold sorry. It takes anywhere from three to six hours to make a ring I generally consider my time to be worth at least $10 an hour so anywhere from $30 to $60 plus the cost of the original coin. I am however not motivated buy the money as such and i have done work for a lot less.