Gatsby Jewellery Ltd has dated this piece to the 1950s.

Accompanied by an independent jewellery report from IGR (#30308946).
Cut – Round cabochon sapphire and rose cut diamonds.
Colour – The diamonds are G to H.
Clarity – The sapphire is SI. The diamonds are VS2 to SI2.

Carat – The sapphire is a known 9.20 carat, with a total approximate diamond weight of 0.78 carat.
Size – P (UK) or 7.5 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The head of the rings is 17.1 x 16.9mm and sits 10.5mm from the finger.
Metal – Platinum. Tested.
com/447155041
2538S390
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