“It is unusual that an engagement ring would be removed in place of an eternity ring. So, if the infamous Princess Diana ring is being cleaned or resized, it seems that Princess Kate has used the ring in its place to help disperse any rumours.

“The ring looks to be a more subtle and understated band compared to her sizable engagement ring. The style of the intricate ring seems to be gold composed with small gemstones which are either garnets or sapphires.”

He continued: “This looks to resemble the promise ring that Prince William gave Kate at university when they first started dating; this was a rose-gold Victorian band embellished with pearls and garnets: representing both their birthstones. If the stones are sapphires, then it is the perfect homage to the ring it replaced.”

The expert also explained that Kate has very specific tastes when it comes to jewellery, saying: “Kate Middleton’s usual jewellery style tends to be very influenced and dependent on what outfit she has chosen to wear. Because of this, she has been seen to style both gold and silver jewellery.

The designs of her rings and earrings are traditionally fitting for the modern world of jewellery trends, with intricate gold and silver designs that emboss gemstones to give them a subtle statement. Amongst her favourites are pearls which are fitting for them being Prince William’s birthstone.

“When it comes to bracelets, her affinity for intricate gold and silver designs also takes precedence. Only seen on her right hand, she opts for designs that feature textured bands of chains or gemstones. This is also mirrored with her necklace choices, which tend to feature a small chain, donned with a statement gemstone pendant. Her choice for gemstones sets the bar for current trends as we are seeing more and more commercial jewellery opt for more traditional stones like emeralds and sapphires, similar to the Princess’ style of garnets and pearls.”