Gatsby Jewellery Ltd has dated this piece to the 1920s.
The stone is secured in a six-claw platinum collet with fine marquise detailing in the gallery, leading to a slender platinum shank with ridged detailing at the shoulders.

Accompanied by a Diamond Grading Report from EGL Platinum (#2151018725).
Cut – Old European cut.
Colour – G.
Clarity – SI2 (clean to the naked eye).
Carat – 1.16.
Circa – 1920.
Size – M 1/2 (UK) or 7.5 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The diamond is 7.04 x 6.98mm. Sits 6.1mm from the finger.
Metal – 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