Gatsby Jewellery Ltd has dated this piece to the 1920s.
The stone is secured in a platinum eight-claw coronet coronet collet, leading to a slim 18k yellow gold shank with plain, spear-shaped shoulders.

Accompanied by a Natural Diamond Grading Report from HRD Antwerp (#210000182427).
Cut – Old European cut.
Colour – G.
Clarity – VS2.
Carat – 0.70.
Circa – 1925.
Measurements – The diamond is 5.61 x 5.78mm. Sits 6.1mm from the finger.
Size – M 1/2 (UK) or 6.25 (US). Complimentary sizing is available, can go up or down.
Metal – 18k yellow gold and 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