Gatsby Jewellery Ltd has dated this piece to the 1950s.
The onyx sits within a handmade mount with semi-circle detailing in the gallery, leading to a slim and flat 18k white gold shank.

Accompanied by an independent jewellery report by IGR (#30309708).
Cut – Old European cut.
Colour – M.
Clarity – SI1.
Carat – The diamond is approximately 0.45 carat.
Circa – 1950.
Size – N 1/2 (UK) or 6.75 (US). Complimentary sizing is available, can go up or down.
Measurements – The head of the ring is 11.15 x 11.15mm. Sits 5.5mm from the finger.
Metal – 18k white gold. Tested.
Gatsby Jewellery Ltd has dated this piece to the 1950s.
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