2000 years ago, nearly everyone in the Roman world wore protective amulets. Phallic imagery (Fascinus - look it up!) was very popular to ward off the evil eye (invidia). We have lots of examples in museums all over the world, and many are small, either worn by children or as pinky rings.
I do Ancient Roman living history / reenactment, and once wrote a 31 page research paper on sexual imagery of the period. I'm including a small stack of the books I referenced in the photos.

Sterling silver, each one unique (just like the real ones!)! All rings shipped in a gift box with an anti-tarnish tab.

Only three left from this batch - please select your choice.

B size 3 (shaft is gold color - made of brass)

F size 7.5
G size 7.5