Exhibit Antiques has dated this piece to the 1880s.
Beautiful combination of colouful Scottish agates. Its a five petal yellow flower, probably a primrose.

Cant recall seeing another example.
Date & Origin
Scotland, c1880.
Condition
Excellent, age-related wear as shown. Pin to rear in working order. No chips or cracks. Silver unmarked which is quite normal for Scottish Jewellery of this type.
Dimensions
Length: 7.3cm, Width: 4cm
Exhibit Antiques has dated this piece to the 1880s.
Specialists in 18th & 19th century antique glass
You can view the stock and full dealer information on the Exhibit Antiques Profile Page