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 evidence of heating.
Cut: Oval cut sapphire and rose cut diamonds.
Colour: The diamonds are G to H.
Clarity: The diamonds are SI1 to SI2.

Carat: The sapphire is 3.61 carat, with a total approximate diamond weight of 0.08 carat.
Circa: 1930.
Size: K 1/2 (UK) or 5 3/8 (US). Free sizing available.
Measurements: The sapphire is 7.8 x 15.8mm. The ring sits 4.25mm from the finger.
Weight: 4.15 grams.
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