I'd prefer cheaper metal such as silver but quote price for others metals too if you can
Take a coin (one with silver content so its soft enough) and VERY gently bang around the perimeter with a hammer on a surface like an anvil. You have to bang VERY gently (and also be very patient!) or you will warp the coin. Once you have it banged down to the appropriate size, drill as large a hole as you can in it. Finish by hand with a metal filer. I make rings like this all the time. Its very easy but does require patience. Good luck.
Thanks for suggestion, I don't have silver coin, drill. I need professionally polished one.