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

Accompanied by an independent jewellery report from IGR (#30310123).
Cut – Oval cut sapphire and eight-cut diamonds
Colour – The diamonds range from F to G.
Clarity – The diamonds are VS2 to SI1; all are clean to the naked eye.

Carat – The sapphire is approximately 1.10 carat, with a total approximate diamond weight of 0.60 carat.
Circa – 1940.
Size – J (UK) or 4 5/8 (US). Complimentary sizing is available, can be sized up or down.

Measurements – The head of the ring is 11.8 x 10.5mm and sits 5mm from the finger.
Metal – Although the band is stamped PLAT, just the diamonds and the sapphire are set in platinum. The rest of the ring is 18k white gold. Tested.
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