There are many great video's on people's techniques and tips,..watch them,...but doing is the only way to get these uniform.
Step 1: Step One
1. Start with the coin of your choice,...quarters are good to start with.
2. Stamp a hole in the center of the coin
3. Using tweezers, hold coin in a flame until it glows,...then drop in water
Step 2: Step 2
one in water it is immediately cool to the touch......
Place on a ring mandrel and start pounding (downwards) with a plastic hammer.
-------=this is the challenge and determination part---------
continue to hammer until one size below your desired ring sizing.
then remove coin/ring place on mandrel other side down.
Hammer to desired diameter and then smooth out with sanding blocks!
Cheap but labor intensive!!!