Corvidae Antique has dated this piece to the Edwardian era.
The brooch comes complete with the antique silk-lined Gieves case pictured, which may be its original home.

SIZE: 2.3 x 2.5cm.
WEIGHT: 3.9g.
MATERIALS: 15-carat gold, opal, demantoid garnet.
HALLMARKS/STAMPS: Marked 15CT on the reverse. Fifteen-carat gold pieces are not overly common (in the UK only really used between 1854 and 1932) and this fineness was generally used in high quality pieces.
CONDITION: The brooch is in excellent antique condition. The box is in great condition but has some pen marks inside the lid.
ERA: Estimated Edwardian (c.1901-1914).
Corvidae Antique has dated this piece to the Edwardian era.
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