Gatsby Jewellery Ltd has dated this piece to the 1930s.
The stone is secured in a six-claw platinum collet which sits between spear-shaped shoulders, to a slim and fluted 18k yellow gold shank.

Accompanied a Natural Diamond Grading Report from HRD Antwerp.
Cut: Old oval cut.
Colour: L.
Clarity: VS1.
Carat: 2.50.
Circa: 1935.
Size: L (UK) or 5 1/2 (US). Free sizing available.
Weight: 3.91 grams.
Metal: 18k yellow gold and platinum. Tested with a Niton DXL Precious Metal Analyzer.

Video: To view videos of this ring recorded in daylight, please either contact us or copy / paste the following link into your browser: https://gatsbyjewellery.co.uk/products/vintage-2-50-carat-old-oval-cut-diamond-solitaire-ring-circa-1935
Item # 913314S122
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