AgAu Jewellery has dated this piece to the 1940s.

Metal: 9ct yellow gold.
Stone(s): 1 x opal (1.50ct), 8 emeralds, totalling (0.40ct)
Measurements: Ring face 12mm x 12mm
Hallmark: Marked for 9ct
Size. Size O 1/2
Weight: 3.1g
Condition: Excellent condition
AgAu Jewellery has dated this piece to the 1940s.
Agau jewellery offer an extensive range of 9ct and 18ct gold jewellery.
You can view the stock and full dealer information on the AgAu Jewellery Profile Page