Inspired by August Kekulé's discovery of the structure of benzene. An ouroboros is engraved in a benzene ring. This ring is 18.6 mm in diameter or a US ring size of 8 5/8.
Contact me if you have another size in mind and I will scale as needed. Please buy the plastic model first to test the fit on your finger (A little abrasive but good for general sizing). Looks great in polished silver!