Gatsby Jewellery Ltd has dated this piece to the 1930s.
The stone is secured by eight yellow gold claws within a surround of eight old cut diamonds in a white gold coronet setting. A further two diamonds (one each side) are set in the white gold shoulders, leading to a slim 18k yellow gold shank.

Accompanied by a ruby report from The Gem & Pearl Laboratory stating the ruby shows no indications of heating, and is Burmese (Myanmar) in origin, from Mong Hsu.
Cut – Cushion cut ruby and old cut diamonds.

Colour – The diamonds are between F and G.
Clarity – The ruby is SI. The diamonds are SI1 to SI2.
Carat – The ruby is approximately 1.06 carat, with a total approximate diamond weight of 1.28 carat
Circa – 1925.

Size – N 1/2 (UK) or 6.75 (US). Complimentary sizing is available, can go up or down.
Measurements – The ruby is approximately 6.2 x 5.5mm. The head of the ring is 13.1 x 12.4mm and sits 6.3mm from the finger.
Metal – 18k white and yellow gold. Tested.
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.
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