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 Edwardian era.

The ring is in very good antique condition, though the four tiny side stones are a little green.
Size M (UK), approximately 6 and a quarter (US). The large stone measures approx 6mm across - if it were a diamond it would be almost a carat. It sits around 8mm above the finger.
Marked "9CT & SIL" inside the shank.
Weight: 1.7g.
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Corvidae Antique has dated this piece to the Edwardian era.
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You can view the stock and full dealer information on the Corvidae Antique Profile Page