Ring made of silver clay with a texture obtained by using rubber texture mats specially developed for (metal) clay.
First, roll a tube. A pressure plate is very handy for this. Then roll out between slats of 2mm and then roll out on the texture mat with 1.5mm laths. Lightly spray the mat with Coolslip anti-stick formula. This prevents the clay from catching in the texture. Be careful not to use too much because the texture will float and the print will not be sharp.
Then cut the ring binder to the desired size with a clay knife
Read on here for ring making instructions.