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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