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

Accompanied by a sapphire report from Gemmological Certification Services (GCS) stating the sapphire shows no indication of heating, and is Sri Lankan (Ceylon) in origin.
Cut – Cushion cut sapphire and transitional cut diamonds.

Colour – The diamonds are F to G.
Clarity – The sapphire is eye clean. The diamonds are VS2 to SI2.
Carat – The sapphire is 2.92 carat. The total approximate diamond weight is 0.60 carat.
Circa – 1940.
Size – R (UK) or 8 5/8 (US). Complimentary sizing is available, can go up or down.

Measurements – The sapphire is 8.4 x 6.2mm. The ring is 10mm at the widest point and sits 6.25mm from the finger
Metal – The diamonds and sapphire are set in platinum. On a 18k yellow gold shank. 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