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 Victorian era.
Note the lovely detailing on the shoulders.

SIZE: L and a half (UK), 6 (US). The gem-set face of the ring is approx 2cm when measured straight across and 9mm tall.
WEIGHT: 1.9g.
MATERIALS: Nine-carat (375) gold, amethyst, pearl.
HALLMARKS/STAMPS: Hallmarked for nine-carat gold, Birmingham Assay Office, and stamped NBS.

CONDITION: In good antique condition, with some wear to the claws and the facets of the amethysts; all the stones are firmly set and the pearls have retained a lovely nacre. The ring has been resized at some time, losing the date letter of the hallmark.
ERA: Estimated Victorian c.1860s.
Corvidae Antique has dated this piece to the Victorian era.
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You can view the stock and full dealer information on the Corvidae Antique Profile Page