The King George VI Victorian suite and the Belgian sapphire tiara are the third and fourth most expensive pieces of sapphire jewellery in the Royal Family, both estimated to be worth £5million each according to jewellery experts at Steven Stone. 

The experts took a closer look at the original necklace and said it features 18 sapphires, sat on a gradient, ranging from eight to 30-carats, before it was redesigned in 1952.

These huge sapphires are surrounded by a halo of diamonds and linked together by additional single-stone diamonds, which are between 0.8ct and 1.5ct.

When Queen Elizabeth altered the necklace, she removed four of the sapphire clusters from the back and remodelled and reset one of the larger stones from the front, to create a beautiful pendant for the necklace which Camilla chose not to wear this evening. 

READ MORE: King Charles’ friend on moment with monarch he’ll ‘cherish forever’