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 1960s.
The stone is claw set within a square collet featuring beautiful lace-like detailing in the gallery and running down the shoulders, with a light brown princess cut diamond accenting each shoulder.

Accompanied by a colored diamond report from GIA (#2185288735)
Cut – Old mine cut in the centre, with princess cut diamonds in the shoulders.
Colour – The centre is fancy dark pinkish brown, with fancy light brown diamonds in the shoulders.

Clarity – SI2; all the stones are clean to the naked eye.
Carat – The centre is a known 0.75 carat, with a further approximate 0.10 carat in the shoulders.
Circa – 1960.
Size – J (UK) or 4 5/8 (US). Complimentary sizing is available, can go up or down. Please contact us before order if you would need this re-sized.

Measurements – The centre stone is 5.35 x 4.4mm. The head of the ring is 8.4 x 8.5mm and sits 7.5mm from the finger.
Metal – 18k white gold. Tested.
https://www.gatsbyjewellery.co.uk/product/mid-century-0-75-carat-fancy-dark-pinkish-brown-old-cut-diamond-ring-circa-1960/
Gatsby Jewellery Ltd has dated this piece to the 1960s.
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