Crispin Jewellery has dated this piece to the Edwardian era.
This piece is most likely made in France
HALLMARKS
Not Hallmarked so tests as

MEASUREMENTS
Central Old cut diamond; 2.5mm.
Diamond clarity; Si2, immaculately eye clean
Diamond colour; J
Old rose cut diamonds; 1-1.5mm
Calibre cut sapphires; 1mm
Ring head; 13 x 8mm
WEIGHT
1.9g
CONDITION
Good condition, wear commensurate of age. A beautiful and sought after traditional design. Not a reproduction.
RING SIZE
GB N US 6 3/4
Crispin Jewellery has dated this piece to the Edwardian era.
You can view the stock and full dealer information on the Crispin Jewellery Profile Page