AgAu Jewellery has dated this piece to the 1910s.

Metal: Pendant is 9ct yellow gold. The chain is 18" 9ct yellow gold,
Stones: 1 amethyst (1.50ct)
Size: Pendant size 2.5cm long/ 1.4cm wide. Chain size 46cm/ 18"
Hallmarks: Pendant/chain 9ct
Weight: 1.5g
Condition: This item is presented in very good condition
AgAu Jewellery has dated this piece to the 1910s.
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