Andrew Nethercott Antiques has dated this piece to the 1800s.
Probably Irish, early 19th century.

Graduated hand cut sparkling foil backed clear paste stones, set in silver with gold highlights
Originally made as a pendant, later bar mounted as a brooch
Unmarked, guaranteed solid silver and gold
height 1,1/4" or 32.5mm weight 7.8 grams
With new presentation fitted box
Andrew Nethercott Antiques has dated this piece to the 1800s.
Works of art, collectables, scientific and decorative antiques from the 17th - 20th century
You can view the stock and full dealer information on the Andrew Nethercott Antiques Profile Page