It was listed by AgAu Jewellery. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
AgAu Jewellery has dated this piece to the 1920s.
Each shoulder has three single-cut diamonds mounted in Platinum. Total diamond content approx. 0.6ct.

Hallmarked 18ct & Plat
UK size M1/2
A Beautiful Art Deco Diamond solitaire ring featuring a 5mm European-cut Diamond, mounted in a claw setting with diamond mounted shoulders. Each shoulder has three single-cut diamonds mounted in Platinum.
AgAu Jewellery has dated this piece to the 1920s.
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You can view the stock and full dealer information on the AgAu Jewellery Profile Page