The phrase "horn ring" refers to a circular device or ornament that is worn or placed on the horn of an animal, often used for decorative purposes or as a symbol of status. Full definition
All of their pieces are handcrafted with excellence & are made to wear every day — I'm also loving this crescent horn ring, this dainty necklace & these triangle earrings. (pennypincherfashion.com)
My carved horn ring is from the Alys Shoppe in Florida (and I'm sure if you called them they could hook you up!) (apieceoftoastblog.com)
Thin, hard - plastic steering wheels with inset horn rings — this example is from a 1959 Pontiac — were defining features of postwar American iron. (automobilemag.com)