Gatsby Jewellery Ltd has dated this piece to the 1960s.

Accompanied by an independent jewellery report from WGI.
Cut: Cushion cut ruby and round brilliant cut diamonds.
Colour: The diamonds are G to H.
Clarity: The ruby is eye-clean. The diamond are SI1 to SI2.

Carat: The ruby is approximately 0.65 carat. The total approximate diamond weight is 0.50 carat.
Size: P (UK) or 7 1/2 (US). Free sizing available.
Measurements: The ruby is approximately 6.45 x 5.12mm. From the edge of one outer diamond to the other is 19.1mm. The ring is 6.6mm at the widest point and sits 3.9mm from the finger.

Weight: 3.99 grams.
Metal: 18k yellow gold. Tested with a Niton DXL Precious Metal Analyzer.
co.uk/products/vintage-0-70-carat-ruby-0-50-carat-diamond-ring-circa-1970
Item # 75414S241
Gatsby Jewellery Ltd has dated this piece to the 1960s.
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