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

Accompanied by an independent jewellery report from IGR (#30308547).
Cut – Square step cut fire opal. The diamonds in the surround are old mine cuts with rose cuts in the shoulders.
Colour – The diamonds are G to H.

Clarity – The diamonds are VS2 to SI1.
Carat – The opal is approximately 1.30 with approximately 0.72 carat of diamonds.
Circa – 1940.
Size – M 1/2 (UK) or 6.25 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The head of the ring is 13.1 x 12.5mm. Sits 5.1mm from the finger.
Metal – Platinum, French hallmarks. The opal is set in 18k yellow gold (tested).
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.
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