Engine-turned designs are a collectible mid-century style, usually found on charms but rarely a ring! This could have been converted from a cufflink or another piece of jewelry, and has the sweetest red ruby in the center. It is a nice and sturdy piece, with light wear/patina that gives it that special vintage charm.

14k Ruby Engine Turned Ring - 8.4g - .78” - size 4.5 (sizable to any size)