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
Four larger Old cut diamonds measures; 3mm
Smaller rose cut diamonds 1 - 2mm
Ceylon sapphire; 6 x 4.5mm
Cultured pearls; 3.5mm
Ring head; 16 x 19mm including the diamond shoulders. This is a really fine quality piece

This is a particularly amazing piece, superb design and beautifully white diamonds
WEIGHT
5.5g
CONDITION
Good condition, wear commensurate of age. A beautiful and sought after traditional design. Not a reproduction.
RING SIZE
GB O US 7 1/4
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