It was listed by Gatsby Jewellery Ltd. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Gatsby Jewellery Ltd has dated this piece to the 1900s.

Accompanied a diamond grading report from HRD Antwerp (#180000077625).
Cut – Old mine cut.
Colour – I.
Clarity – VVS2.
Carat – 0.72.
Circa – The diamond is circa 1900 in a modern mount.
Measurements – The diamond is 5.48 x 5.54mm. Sits 6.25mm from the finger.
Size – L 1/2 (UK) or 5 7/8 (US). Complimentary sizing is available, can go up or down.
Metal – 18k yellow; hallmarked. The diamond is set in platinum; tested.
Gatsby Jewellery Ltd has dated this piece to the 1900s.
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