Camilla Parker Bowles stuns in Queen's £3million Greville tiara at Buckingham Palace

Although the Queen has not worn the tiara in public, this is not the first time the Duchess of Cornwall has donned the item.

When she tied the knot with Prince Charles in 2005, the Greville tiara was loaned to Camilla on a long-term basis and she has worn it over the years.

The eye-catching piece has a honeycomb design with a collection of diamonds across it.

As well as the round diamonds set across the design, it was given millegrain detailing on the platinum which made it even more eye-catching.