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 Georgian era.

The pin is in very good condition. The stone is crisply faceted and abrasion free; under magnification there is a tiny chip to one corner but it's imperceptible to the naked eye.
Size: 6 x 0.5cm. The stone measures approx 5 x 7mm.
Weight: 1.0g.
Corvidae Antique has dated this piece to the Georgian era.
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You can view the stock and full dealer information on the Corvidae Antique Profile Page