Duchess Sophie proved why she’s considered the backbone of the Royal Family as she arrived at the state banquet in her signature style.

Duchess Sophie delivered a refined display of royal poise at Windsor Castle this evening as she arrived for the state banquet in support of King Charles and Queen Camilla. Often described as the backbone of the monarchy, the 60-year-old once again stepped up for the Firm, accompanying her husband, Prince Edward, at the high-profile diplomatic event.

Sophie looked effortlessly elegant in a sleek black evening gown, which featured a softly off-the-shoulder neckline. The clean lines allowed her jewellery and honours to take centre stage.

The duchess wore her hair in soft, flowing waves, a polished style that framed her face beautifully beneath her sparkling tiara worth £1 million.

The Duchess of Edinburgh completed her look with her Royal Sash and Star (Image: Getty)

Sophie opted for her go-to diadem, the Aquamarine Tiara – one of the most distinctive and radiant pieces associated in her jewellery collection.

Its cool sea-green gemstone and elegant Art Deco–inspired structure paired beautifully with her classic, understated gown, adding a refreshing lift to her timeless ensemble.

The Duchess has long been linked to this tiara, selecting it for many significant state occasions thanks to its graceful yet modern feel.

State Visit By The President Of The Federal Republic of Germany – Day 1

Duchess Sophie dazzled at the State Banquet as she donned the Aquamarine tiara (Image: Getty)

Notably, this tiara is believed to be part of Sophie’s personal collection rather than an official royal loan, meaning it is unlikely to be worn by other family members – though one day, royal watchers may well see Lady Louise borrow it, should her mother choose to pass it down.

Earlier in the day, the Royal Family welcomed President Frank-Walter Steinmeier and the First Lady with a ceremony full of British pageantry, officially opening the German state visit. For tonight’s formal celebrations, Sophie embraced her signature polished style, opting for an elegant ensemble that balanced sophistication with quiet glamour.

She finished her look with a shimmering selection of jewels that glinted under the lights of the Castle, adding a personal touch to her appearance.

The Duke and Duchess of Edinburgh

Duchess Sophie smiled as she proudly stood beside Prince Edward (Image: Getty)

President Steinmeier and the First Lady arrived in the UK earlier today, where the Prince and Princess of Wales were on hand to greet them moments after they stepped off the plane.

As the day continued, the German visitors travelled to Windsor Castle to meet the King and Queen, who led them through a curated exhibition set up inside the Green Drawing Room.

The Duke and Duchess of Edinburgh were present for the engagement as well, as the royals showcased a selection of German-linked treasures from the Royal Collection – offering a rich cultural context to mark the start of the state visit.