Woodbridge Antiques has dated this piece to the 1900s.
There is a good fastening pin on the back and the brooch is marked 9ct. The gold is rose, which perfectly enhances the peridot and the pearl.

A gorgeous brooch in wonderful condition.
Period: Art Nouveau 1895 - 1920
Measurements: Width: 3.2 cm Height: 2.4 cm Weight: 2.1 grams
Weights and measurements are approximate.
NJL34913
Woodbridge Antiques has dated this piece to the 1900s.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page