Vintage Sterling Silver Ring with Peridot Green Glass Stone, with issues, small size 4-1/2

Vintage sterling silver ring, I think it is pre 1940s. Marked 'Sterling' with maker's initials after it. Light green glass stone in the setting. It is a small size - 4-1/2.
The ring is in good condition. It is aged and tarnished, needs to be cleaned. Light wear.
One of the prongs that holds the stone is broken off.