Yeah pretty much.
I thought it was going to be a big job.
Any idea on how much someone would charge to do it? I imagine it is going to be expensive. I think i will try and do one of tjem myself first. It will be good practice.
Don't know how much a jewller will charge but I presume it will be hour work each ring, if they have all the equipment.
Go to a hardware store buy a small fine file and roughly get it to shape first than buff it up with 240 grit, 400grit, and 800 grit sandpaper, to resemble what you would like.
After that take it jeweller for final mirror finish. If you do the above like it will take a jeweller 30 minutes to give all four rings a mirror finsh, and likely to take on the job for reasonable price.
.................................................................................................................................
If this is likely to turn into a hobby, personally just buy some D wire from below a place like below, some solder, mandrel, rubber mallet and dremel. I presume you a torch if you casted yourself.
https://palloys.com/metals/wire/soft-curve-half-round/MWSR00001
https://palloys.com/metals/solder/wire/MDWR00001
Once you have measured the right length of silver D wire, the rings can be made in few hours, than as above all you need is two hundred dollars of equipment.
If this is likely going to turn into hobby buy a tumbler and a dremel to get a mirror finish, but if this is an once off it is an overkill.
PS: Buying ready made wire is going to be cheaper than getting a shop to polish it down smooth mirror finish.