Exhibit Antiques has dated this piece to the 1860s.
An outer ring of Scottish Agate gemstones with a further central cross of agates with a central Citrine all set in beautiful ornate Silver. Kite mark on rear dates to 1866.

A superb 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. Kite mark on silver dates to 1866.
Dimensions
Diameter: 4.5cm
Exhibit Antiques has dated this piece to the 1860s.
Specialists in 18th & 19th century antique glass
You can view the stock and full dealer information on the Exhibit Antiques Profile Page