It was listed by Gatsby Jewellery Ltd. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Gatsby Jewellery Ltd has dated this piece to the 1930s.
The highly detailed shank features grooved detailed at the shoulders, with fine fluting running down the reverse tapering D-shaped shank.

Accompanied by an independent jewellery report from IGR (#30307819).
Cut – Old mine cut.
Colour – M.
Clarity – SI2.
Carat – The centre is a known 0.68 carat.
Circa – 1935.
Measurements – The diamond is approximately 4.6 x 5.1mm. The ring is 8.1mm at the widest point and sits 6.3mm from the finger.

Size – N (UK) or 6.5 (US). Complimentary sizing is available, can go up or down.
Metal – 18k rose gold. The diamond is in platinum. Tested.
https://www.gatsbyjewellery.co.uk/product/art-deco-0-68-carat-old-cut-diamond-engagement-ring-circa-1935-2/
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