Duchess of Edinburgh wears infinity pendant as she steps out without Lady Louise

The 60-year-old royal wore a dazzling silk dress featuring three-quarter puff sleeves, paired with an exquisite pillbox hat in the matching tone.

In addition, the duchess accessorised her green ensemble with gold jewellery, including her signature G.Collins and Sons Diamond Set Infinity Pendant.

The piece features "bold and organic lines" with "a spray of diamonds set into the centre piece and a halo of diamonds surrounding it," according to its description.

The pendant's open-work design allows it to be worn directly on skin or over clothing, offering complete versatility.

Sophie has worn this distinctive jewel consistently since 2017, with its most recent appearance before Saturday being at the VE Day commemorations last month.

The mother-of-two styled her signature blonde hair in an elegant updo, complementing the look with subtle makeup that enhanced her features.

The monochromatic green ensemble stood out amongst the traditional pastel palette typically favoured by royal ladies at the summer event.

Her choice of the bold jewel tone marked a departure from last year's butter yellow outfit.

Sophie attended Trooping the Colour without either of her children, Lady Louise, 21, and James, Earl of Wessex, 17.

Louise is currently studying at the University of St Andrews, and James is an A-Level student at Radley College in Oxfordshire.

The duchess arrived at the parade in a horse-drawn carriage alongside Vice Admiral Sir Tim Laurence, Princess Anne's husband.

Her husband, Prince Edward, made a separate entrance on horseback, joining Princess Anne and Prince William.

As Colonel of the Scots Guards, the Duke of Edinburgh wore the regiment's full ceremonial uniform. His attire included the Thistle Star and Sash, GCVO Star, Coronation and Jubilee medals, plus his New Zealand and Canadian orders.

As a personal aide-de-camp to the King, Edward wore ornamental braided aiguilettes on his shoulders. He bore the cyphers of both King Charles and his late mother, Queen Elizabeth.

Trooping the Colour marks the reigning monarch's official birthday, a tradition spanning over 260 years. The event features more than 1,400 parading soldiers, 200 horses and 400 musicians in a display of military precision and horsemanship.

The parade travels from Buckingham Palace down The Mall to Horse Guards Parade, concluding with a Royal Air Force fly-past.

King Charles and Queen Camilla attended alongside the Prince and Princess of Wales with their three children, Prince George, Princess Charlotte and Prince Louis.

The Princess Royal was also present at the landmark event, which draws thousands of royal fans to London's streets and is broadcast on television.