It was listed by Corvidae Antique. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Corvidae Antique has dated this piece to the 1920s.
The five diamonds graduate in size from approximately 2 to 2.5mm, with a conservative estimate of 0.22 carats in total weight.

In very good antique condition with normal wear for an item of this age.
Marked 18CT PLAT and MG&S inside the shank.
Size: K (UK), 5 (US). The face of the ring is 1.2cm across and it sits around 4mm above the finger.
Weight: 1.6g.
Corvidae Antique has dated this piece to the 1920s.
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You can view the stock and full dealer information on the Corvidae Antique Profile Page