Goldtone Convertible Hoop Earrings

Earrings - Sarah Coventry ? Sleek goldtone hoop earrings with ball top. Ball can be removed to wear as just studs. 1" in diameter. Balls are approximately 5mm in diameter. Very good condition.

The wing backs are marked SARAH. The convertible styling leads me to believe that these are from Sarah Coventry, but I cannot identify these.