Gatsby Jewellery Ltd has dated this piece to the 1920s.
The stone is secured in a six claw platinum collet with geometric detailing in the gallery, with raised shoulders set with eight (four each side) eight-cut diamonds.

Accompanied by a Natural Diamond Grading Report from HRD Antwerp.
Cut:? Old mind cut diamond in the centre, with eight-cut diamonds in the shoulders.
Colour:? The centre is I. The diamonds in the shoulders are G to H.

Clarity:? VS1 in the centre. The diamonds in the shoulder are VS1 to VS2.
Carat:? 1.13 carat in the centre, with a further approximate 0.08 carat in the shoulders.
Circa:? 1925.
Size:? L (UK) or 5.5 (US). Free sizing available.
Measurements:? The diamond is 6.33 x 5.82mm. Sits 6.5mm from the finger.
Weight:? 3.91 grams.
Metal:? Platinum. Tested with a Niton DXL Precious Metal Analyzer.
Item # 391012S015
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