AgAu Jewellery has dated this piece to the 1960s.

Metal: 9ct white gold.
Stone(s): 1 x London blue topaz (0.25ct), 1 x Swiss blue topaz (0.50ct), 21 x diamonds, totalling (0.20ct)
Measurements: Pendant 22mm x 7mm, Chain 16"/40cm
Hallmark: Marked for 9ct
Weight: 2.0g
Condition: Excellent condition
AgAu Jewellery has dated this piece to the 1960s.
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