Princess Anne is one of a few royals known to favour sapphire jewellery, with the Queen, Duchess of Cambridge and late Princess of Wales all sporting the stone in recent decades.

Sapphires are considered one of the most precious stones in the world, and they are thought to hold special symbolism.

Mr Stone added: “It’s clear the Royal Family are huge fans of sapphires, a stone which is traditionally believed to attract abundance and blessings.

“Historically it has been used to protect against negative energies, as well as calm the mind, strengthen intuition, and invite spiritual clarity, so it’s no wonder the royal ladies love them.”