Digby Antiques (Wiltshire) has dated this piece to the 1930s.

Fully marked to the back Birmingham 1935.
They are so good and so decorative that they could be used as a scarf ring!
In excellent condition.
The box is associated but is in good order.
Each ring measures L 6 cm W 4 cm H 2.5 cm
The stones are 2 x 2 cm
Digby Antiques (Wiltshire) has dated this piece to the 1930s.
You can view the stock and full dealer information on the Digby Antiques (Wiltshire) Profile Page