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.

Contemporary hallmarks. London.
Cut – Cushion shaped old mine / miner cut.
Colour – I.
Clarity – SI1; stone is clean to the eye.
Carat – 1.27.
Circa – The diamond is from the late 19th century, in a mount from the late 20th century.

Size – N 1/2 (UK) or 6.75 (US). Complementary sizing is available, can go up or down.
Measurements – The diamond is approximately 6.5mm by 6.4mm and sits 6.6mm from the finger.
Metal – Platinum. Full English (London) assay marks.
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