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 1890s.

Accompanied by an independent jewellery report by IGR (#30307820).
Cut – Old pear cut in the centre with old mine cuts in the surround.
Colour – The centre is I colour, with F to H coloured diamonds in the surround.

Clarity – The centre is VVS2. The diamonds in the surround are SI1 to I1; all are clean to the naked eye.
Carat – The centre is approximately 0.50 carat with a total approximate overall weight of 0.80 carat.

Circa – 1890.
Size – Q (UK) or 8 (US). Complimentary sizing is available, can go up or down.
Measurements – The head of the ring is 13.4 x 11.8mm and sits 4.9mm from the finger.
Metal – The top of the ring is silver, on a 18k white gold shank. Tested.
https://www.gatsbyjewellery.co.uk/product/victorian-0-80-carat-old-pear-cut-diamond-cluster-ring-circa-1890/
Gatsby Jewellery Ltd has dated this piece to the 1890s.
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