Matching set of 10 mm and 12 x 18 mm Amber Stone Sterling Silver Ring

This is a beautiful matched set of amber bezel set earrings and a ring in sterling silver.
The earrings are each 10 mm and the amber stone in the ring is 12 x 18 mm.
The ring is a size 6.
There are two marks inside the ring one is EF and one is 925 S
May be made by Einer Fern from Denmark, where my mother shopped frequently for jewelry.