Gatsby Jewellery Ltd has dated this piece to the 1930s.

Accompanied by a sapphire report from The Gem & Pearl Laboratory stating the sapphire shows no indication of heating, and is Sri Lankan (Ceylon) in origin.
Cut – Emerald cut sapphire and old cut diamonds.

Colour – The sapphire is blue in daylight and purple under incandescent light. The diamonds are F to G.
Clarity – The sapphire is eye clean. The diamonds are VS1 to VS2.
Carat – The sapphire is 2.75 carat. The total approximate diamond weight is 0.80 carat.
Circa – 1930.
Size – Q (UK) or 8 (US). Complimentary sizing is available, can go up or down.
Measurements – The sapphire is 8.5 x 6.4mm. Sits 6.4mm from the finger.
Metal – Platinum. French hallmarks.
Gatsby Jewellery Ltd has dated this piece to the 1930s.
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