Gatsby Jewellery Ltd has dated this piece to the 1940s.

Accompanied by a Natural Diamond Grading Report from HRD Antwerp (#210000182426).
Cut – Old European cut.
Colour – H.
Clarity – VVS1.
Carat – 0.74.
Circa – 1940.
Size – M (UK) or 6 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The diamond is 5.75 x 5.76mm and sits 5mm from the finger.
Metal – 18k white gold and platinum. French hallmarks.
Gatsby Jewellery Ltd has dated this piece to the 1940s.
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