Gatsby Jewellery Ltd has dated this piece to the 1950s.
The stone is secured in a six claw coronet collet, between high, yellow gold shoulders set with a further eight (four each side) eight-cut diamonds. With shaped marquise detailing at the top of the slim D-shaped yellow gold shank.

Accompanied by an independent jewellery report from WGI (#WGI9624144884).
Cut – Old European cut (eight-cuts in the shoulders).
Colour – H (G to H in the shoulders).
Clarity – SI1 (VS1 to VS2 in the shoulders).

Carat – 0.50 (with a further approximate 0.01 carat in the shoulders).
Circa – 1920.
Measurements – The diamond is approximately 4.9mm in diameter. Sits 5.8mm 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 1950s.
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