It was listed by AgAu Jewellery. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
AgAu Jewellery has dated this White Gold Blue Topaz Necklace 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 White Gold Blue Topaz Necklace to the 1960s.
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You can view the stock and full dealer information on the AgAu Jewellery Profile Page