AgAu Jewellery has dated this piece to the 1940s.
18ct yellow gold example.
Designed with an emerald cut amethyst to the centre, 8mm x 10mm (3.5ct) approx. To each side are three round cut diamonds in bezel settings.

15mm spread of stones, protruding 7.5mm off the finger.
CONDITION ; Excellent. Clean band. Well set stones, very minor wear only. Please view photographs.
WEIGHT ; 4.4 grams
SIZE ; L 1/2 UK, 6 US
HALLMARKS ; 18ct
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