Gatsby Jewellery Ltd has dated this piece to the 1930s.

Accompanied by a diamond report from IGI (#564388967).
Cut – Old European cut.
Colour – H.
Clarity – SI1.
Carat – 0.71.
Circa – 1930.
Size – N (UK) or 6 1/2 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The diamond is 5.54 x 5.76mm and sits 6.4mm from the finger.
Metal – 18k yellow gold and platinum. Tested.
Gatsby Jewellery Ltd has dated this piece to the 1930s.
Gatsby jewellery are a husband and wife team who have years of knowledge and experience in dealing in fine antique jewellery.
You can view the stock and full dealer information on the Gatsby Jewellery Ltd Profile Page