Gatsby Jewellery Ltd has dated this piece to the 1920s.
The stone is secured in a six claw platinum collet with striking geometric detailing in the gallery. Six (three each side) eight-cuts are set in the migrained shoulders, leading to a slim platinum shank. Top class.

Accompanied a diamond grading report from HRD Antwerp (#180000145819).
Cut – Old mine cut (with eight-cuts of the shoulders).
Colour – E (F to G in the shoulders).
Clarity – SI1 (VS2 to SI1 in the shoulders).

Carat – 1.01 (with a further approximate 0.09 carat in the shoulders).
Circa – 1920.
Measurements – The diamond is 5.63 x 5.82mm. Sits 5.7mm from the finger .
Size – J 1/2 (UK) or 5 (US). Complimentary sizing is available, can go up or down.
Metal – Platinum. Tested.
Video – To view a video of this ring recorded in daylight, please copy / paste the following link to your browser: https://vimeo.com/422740081
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