Gatsby Jewellery Ltd has dated this piece to the 1920s.
Rubover set in platinum, the diamonds lead to a slim, knife-edge 18k gold shank.

Accompanied by a sapphire report from Gemmological Certification Services (GCS) stating the sapphire shows no indication of heating, and is Burmese (Myanmar) in origin.
Cut – Cushion cut sapphire with baguette cut diamonds

Colour – The diamonds are E to F.
Clarity – The diamonds are SI1.
Carat – The ruby is 1.42 carat. Each baguette cut diamond is approximately 0.15 carat.
Circa – 1920.
Size – P 1/2 (UK) or 7.75 (US). Complimentary sizing is available, can go up or down.
Measurements – The sapphire is approximately 8.8 x 6.8mm. Sits 5.3mm from the finger.
Metal – 18k yellow gold. The diamonds are set in platinum. Tested.
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