Gatsby Jewellery Ltd has dated this piece to the 1910s.
The stone is secured in an eight claw yellow gold coronet collet on slim and yellow gold shank. Absolutely gorgeous.

Accompanied by a Diamond Report from IGI (#575300082).
Cut – Old mine cut.
Colour – H.
Clarity – VS2.
Carat – 0.75.
Circa – 1915.
Size – N (UK) or 6.5 (US). Complimentary sizing is available, can be sized up or down.
Measurements – The diamond is 5.80 x 5.51mm. Sits 5.6mm from the finger.
Metal – 18k yellow gold. 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