How to make a coin ring A guy named Don from Michigan posted how-to-pictures doing this with a spoon. I had better luck with a hammer.

Start with 1964 or earlier coins for 90% Silver. 50c piece makes a mens size. The tools. Steel block is just scrap. Use any smooth steel scrap you can find. Marking the center. Start by tapping the edge as you rotate the coin. After 5 min you will see the reeds fading away. 15min reeding is gone... 30min, getting fatter. After 45 min, quarter fits inside. Coins can be used to check roundness. I continued until the ring is smaller than a quarter. Step 1 done. I used a small hammer to finsh and smooth the coin. Drill a hole in the center. You can sand now or later. Clamp coin in soft jaws and bore out center. I use a uni-bit. Wrap a nut driver with tape and spin the ring in a drill. Sand and polish. You can use dremel sanding drums to make adjustments. Polish the inside with dremel polishing wheels. Done. "1964-Liberty-Half Dollar-United States of America" can be read inside. Before - After Finish can be smooth or hammered. For hammered, skip sanding step. A half men's and a quarter women's.