Kate Middleton's latest accessory is a bit of a huge deal for the Queen

(Image credit: Rex)

Last night Kate Middleton attended a state banquet for the official visit of the King and Queen of the Netherlands in London, and naturally dressed for the occasion.

She wore a pale blue ballgown by Alexander McQueen, as well as one of Princess Diana's favourite pieces of jewellery, the Cambridge Lover's Knot tiara, a pearl and diamond affair given to her on her wedding day by the Queen.

The Duchess has actually worn it at several events, so it appears to be one of her favourites too.

But it wasn't the diamonds that everyone noticed, it was the accessory she pinned to her breast. You see the seemingly innocuous brooch is actually a sign that she has been given the Royal Family Order.

The Queen presents it to female members of the Royal Family (only 15 so far) and they're only worn at white-tie events.

The brooch is bordered by diamonds and surmounted by a Tudor Crown in diamonds and red enamel, whilst the reverse, in silver-gilt, is patterned with rays and depicts the royal cypher and St Edward’s Crown in gold and enamel.

Kate's is a little different though, as it's painted on glass rather than ivory like the others, a not to Prince William's ivory ban.

However the Duchess did not wear a blue sash like Camilla or the Queen, as she is not yet a member of the Royal Victorian Order yet, which is likely to come when she has a few more official engagements under her belt.

Penny Goldstone

Penny Goldstone is the Contributing Fashion Editor at Marie Claire UK. She writes about catwalk trends and the latest high street and Instagram sartorial must-haves. She also helms the Women Who Win franchise.

She has worked in fashion for over 10 years, contributing to publications such as Cosmopolitan, Red, Good Housekeeping, and Stylist.