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

Cut – Old cut sapphire.
Clarity – Loupe clean.
Carat – 0.36 carat.
Circa – 1960.
Size – O 1/2 (UK) or 7.25 (US). Complimentary sizing is available.
Measurements – The sapphire is 4mm in diameter and sits 2.9mm from the finger.
Metal – Stamped 18ct – indicating 18k gold – and tests as such.
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