Gatsby Jewellery Ltd has dated this piece to the 1920s.
The six-claw coronet collet sits nice and low to the finger on a slender yellow gold band which tapers at the shoulders and features fluted detailing around the shank

Accompanied by an independent jewellery report from IGR (#30310525).
Cut – Oval shaped old cut.
Colour – I.
Clarity – SI2.
Carat – 1.21.
Circa – 1920.
Size – M (UK) or 6 (US). Complimentary sizing is available, can go up or down.
Measurements – The diamond is approximately 9.5 x 6.6mm and sits 5.3mm from the finger.
Metal – 18k yellow gold.
Gatsby Jewellery Ltd has dated this piece to the 1920s.
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