Gatsby Jewellery Ltd has dated this piece to the 1910s.

This ring is accompanied by an independent jewellery report from IGR.
Cut: Old mine cut
Colour: J
Clarity: VS2
Carat: Approximately 0.95
Circa: 1910
Size: K 1/2 (UK) or 5 3/8 (US). Free sizing available.
Measurements: The diamond is approximately 6 x 5.3mm and sit 6.4mm from the finger
Weight: 2.88 grams
Metal: 18k yellow gold & platinum. Stamped inside the band (750 & 950) and tested to confirm.
Gatsby Jewellery Ltd has dated this piece to the 1910s.
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