Once you are satisfied on the size, you are ready for the next step. If you have a jewelers saw use it to carefully cut the center of the ring out. This will leave you a fat plug of silver to make something else at a latter time if you want. If you do not have a jewelers saw you can drill the center out but be carefull to stay away from the edge. Lay some newspaper down to collect the shavings.
Hey silver is silver.
Mark the center and punch it, this way your drill will not walk around the coin. Before you are ready to drill,wrap 4 or 5 layers of grey tape around the edge of coin to protect the finish You will be holding the coin with plyers while you are drilling the center out. Best done to lay the plyers and coin on piece on wood so as you are drilling you do not send the drill bit through the palm of your hand. After you have drilled it out you will need a small, fine rat-tail file to finish smoothing out your inside edge. Now it should looks like a ring Congratulations.