“It belongs to a tradition of magical jewels which existed since the Medieval period hence the crystal bound in gold indicative of the fact that it is a talisman.
“Sometimes Christian symbolism was bought into magical jewels because it intensified what was already there in the old religions so it’s a marvellous object I must say,” he continued.
“I used to wear it but I wasn’t doing it much good,” the owner admitted.
Going on to value the object, Geoffrey revealed: “It’s in fantastic condition. It’s actually late 17th or early 18th century and this is breathtakingly exciting, I love it.
“The painting could be worth £8,000 to £10,000 and the necklace well, £20,000 of magic you have brought to me today.”
Antiques Roadshow can be streamed on BBC iPlayer.