Corvidae Antique has dated this piece to the Edwardian era.
Marked 9CT HW LD inside the shank. Believed to be the mark of H Williamson Ltd - a jewellers and watchmakers founded by Henry Williamson which traded under various iterations between 1871 and 1932, although from 1921 the business focused largely on clocks and watches.

Size: N and a half (UK), approx 7 (US). The stone measures 1cm diameter and the top sits around 1.3cm above the finger when worn.
Weight: 3.1g.
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Corvidae Antique has dated this piece to the Edwardian era.
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