Crispin Jewellery has dated this piece to the 1940s.
HALLMARKS
Not Hallmarked but tests as
MEASUREMENTS
Natural cushion cut sapphire ; 4mm

Diamond; 4.5mm. Total diamond content approximately 0.35-0.40ct. This is a lovely bright white Si and H colour diamond
Ring head diameter from end to end of gold twist; 12 x12mm
Ring sits 5mm from the finger
Weight 5.2g
CONDITION
Superb condition, a wonderful handmade rare piece.
RING SIZE
GB N US 6 3/4
Crispin Jewellery has dated this piece to the 1940s.
You can view the stock and full dealer information on the Crispin Jewellery Profile Page