Andrew Cox Antiques has dated this piece to the 1890s.
The amethyst is attractively set in a gold mount and the brooch is secured with a pin and C clasp to the reverse. A wonderful period example. Dimensions below.

Postage and packing :- £8.00 UK
£14.00 Europe
£16.00 Outside Europe
Condition :- Excellent, with no damage. The clasp works well and pin hinge strong.
Hallmarks :- Marked 925 - Sterling silver.
Date :- 1890.
Height :- 2.5 cms.
Width :- 3.4 cms.
Depth :- 1.1 cm.
Andrew Cox Antiques has dated this piece to the 1890s.
Specialists in quality antique silver, glassware, jewellery and object de vertu
You can view the stock and full dealer information on the Andrew Cox Antiques Profile Page