Square shaped ring with Garnet ( or stone of your choice, prices may vary.

These are very gorgeous. And if you'd prefer a different stone or an alternative months birthstone please get in touch to discuss as process may vary. 
I've used a 4mm Rose Cut African Garnet here as it was January when I made it. As I said, you can change this up if desired as the rings are made to size and order. 
The ring itself is made using 2mm thick square sterling silver. 
Please let me know a ring size and allow for making time when ordering.