The aquamarine ring features an emerald cut aquamarine flanked by small solitaire diamonds, and is set on a 24-carat yellow gold band. It was made by Asprey in 1996 and is estimated to be worth ...

This has been dated from 1850 and came as part of a Northumbrian estate's possessions. The top of the ring is decorated with five pale blue aquamarines. Aquamarine is a blue variety of 'beryl'.

But Prince Harry has been able to mirror that gesture by giving his wife Meghan Markle a special aquamarine ring, which, it has now been revealed, was a gift for Diana to wear in place of her ...