Gatsby Jewellery Ltd has dated this piece to the 1930s.
The stone is secured by four split claws in an unfussy platinum collet. A high white baguette cut diamond is rubover set in each shoulder, leading to a slim and fluted platinum shank.

Accompanied by a Natural Diamond Grading Report from HRD Antwerp (#210000182378).
Cut – Old European cut with baguette cut diamonds in the shoulders.
Colour – M (F to G in the shoulders).
Clarity – VS2 (VS1 in the shoulders.)

Carat – 3.92 (with a further approximate 0.20 carat in the shoulders).
Circa – 1930.
Size – M 1/2 (UK) or 6.25 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The diamond is 9.75 x 10.01mm and sits 6.5mm from the finger.
Metal – Platinum. French marks.
Video – To view a video of this ring recorded in daylight, please copy / paste the following link into your browser: https://vimeo.com/689678842
Gatsby Jewellery Ltd has dated this piece to the 1930s.
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