Gatsby Jewellery Ltd has dated this piece to the 1910s.
The stones is secured in a fine eight claw platinum collet with coronet style detailing in the gallery, and sits atop a slim, slightly tapering 18k yellow gold shank.

Accompanied by a diamond grading report from HRD Antwerp (#190000182422).
Cut – Old pear cut.
Colour – J .
Clarity – VS1.
Carat – 0.84.
Circa – 1915.
Measurements – The centre stone is 7.43 x 5.37mm. Sits 5mm from the finger.
Size – N (UK) or 6.5 (US). Complimentary sizing is available, can go up or down.
Metal – 18k yellow gold and platinum. Tested.
Gatsby Jewellery Ltd has dated this piece to the 1910s.
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