Corvidae Antique has dated this piece to the Edwardian era.

The brooch is not hallmarked but has been x-ray tested as sterling silver with a nine-carat gold bail (likely added later).
In excellent antique condition.
This listing does not include a chain but the pendant would look equally at home on a silver or gold necklace.
Size: 3.6 x 2.6cm (just over an inch wide), 4.2cm total drop. The moonstone itself measures approximately 2.2 x 1cm.
Weight: 10.3g.
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Corvidae Antique has dated this piece to the Edwardian era.
Hand picked jewellery from a friendly family business
You can view the stock and full dealer information on the Corvidae Antique Profile Page