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 1950s.
Six (three each side) eight-cut diamond adorn the shoulders, leading to a slender, D-shaped shank.

Accompanied by an independent jewellery report from IGR (#30307824).
Cut – Old European cut (with eight-cuts in the shoulders).
Colour – H.
Clarity – SI1.
Carat – Approximately 0.57 in the centre (with a further 0.12 carat in the shoulders).

Circa – 1955.
Size – O 1/2 (UK) or 7.25 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The diamond is 5.3mm in diameter and sits 4.3mm from the finger.
Metal – 18k white and yellow gold.
https://www.gatsbyjewellery.co.uk/product/mid-century-0-57-carat-old-european-cut-diamond-ring-circa-1955/
Gatsby Jewellery Ltd has dated this piece to the 1950s.
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