Woodbridge Antiques has dated this piece to the Victorian era.
Inside the shank are the hallmarks for Birmingham 1854.

A charming ring in lovely antique condition. The band is a good depth - not flimsy and feels nice and solid.
Hallmarks: Birmingham 1854
Measurements:
Ring size UK N
Measurements of setting: shoulder to shoulder 9 mm approx.
Depth of setting 8 mm approx.
Width of band at base: 3 mm approx.
Weight: 3.9 grams
Woodbridge Antiques has dated this piece to the Victorian era.
Specialists in quality antique silver, fine jewellery & accessories
You can view the stock and full dealer information on the Woodbridge Antiques Profile Page