“Whilst both rings are halo designs with oval stones and a cut-down setting, the replica also appears to have diamonds on the side of halo, whereas the original does not. 

“We estimate the ring is around 10 carats, whereas Princess Diana’s is 12 carats.

“Alongside this, the remake has a modern look, whereas Diana’s has a beautiful vintage design.”

According to the experts, a blue topaz ring of this size would cost around £8,000, while a 10-carat aquamarine ring in this style would have a starting price of £30,000.