AgAu Jewellery has dated this piece to the 1930s.
This is dependant on stock.

Metal: 9ct yellow gold
Stones: Sapphire (7.5ct). Diamond 24 x 1 points.
Stone Measurements: Sapphire 13mm x 9mm
Pendant Measurement. 23mm x 15mm
Hallmarks. Unmarked, however fully tested for 9ct gold.
Weight. 3.3g
Condition: Presented in very good condition
AgAu Jewellery has dated this piece to the 1930s.
Agau jewellery offer an extensive range of 9ct and 18ct gold jewellery.
You can view the stock and full dealer information on the AgAu Jewellery Profile Page