
I have made all 3 rings using silver art clay. This is also available as precious metal clay, or PMC. Silver art clay is tiny particles of real fine pure silver mixed an organic binder. I've got a Skutt kiln which I just love. I've got my own timed programme I use for firing silver clay which will burn off the organic binder leaving you with 99.9% fine silver (or .999 fine silver).
.925 Sterling silver is made up of 92.5% pure fine silver and 7.5% of other metals usually copper.
My own personal favorite ring is the middle one. I like the way the grooves are darker and stand out more. I've just listed all 3 rings in my Etsy shop. Click here if you would like to take a closer look.