Gatsby Jewellery Ltd has dated this piece to the 1920s.
The stone is secured in an eight claw platinum collet above a scalloped back-plate. Desperately pretty shaped shoulders lead to a slim and fluted platinum shank.

Accompanied by a Natural Diamond Grading Report from HRD Antwerp (#210000182435).
Cut – Old European cut.
Colour – G.
Clarity – SI1.
Carat – 0.58.
Circa – 1920.
Size – N (UK) or 6.5 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The diamond is 4.89 x 5.19mm. The head of the ring is 10.35 x 13.25 and sits 3.9mm 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