In the 70'same we just scored them with a blade and bent, back and forth and back and forth some more. Easier and quicker if you heat the spoon first, but you can do it either way.
here's how to video https://www.youtube.com/watch?v=H3XwGsHxIzo use this guys way to cut it https://www.youtube.com/watch?v=jJUzMzvMeE4 more https://www.youtube.com/watch?v=Lipu-5bZiVQ here's many more need to look thru these then gather info. on easiest way to cut easiest way to bend etc.. https://www.youtube.com/results?search_query=DIY+spoon+rings some of these people are doing it the hard way and it really depends what the silver ware is made of that you'll be using. Real sterling is easy to bend,silver plated too but may come off, heavy duty 18/10 stainless almost impossible.don't throw cut off pieces away cut holes in them and use them to make chimes or even dbl holes on both sides and string with leather cord and string them together to make a bracelet or use one as a pendant https://www.youtube.com/watch?v=TuLAN5cBnhk&list=PLTfIbpaqEXQX8xvP0MLfb7_Ur9BKbk94K or make other stuff https://www.youtube.com/results?search_query=DIY+repurposing+silverware+into+chimes+and+jewelry
Here is a video tutorial for you: https://www.youtube.com/watch?v=H3XwGsHxIzo
Cut the round part off then hammer it flat then bend into a circle