Jeremy Hinds, Sales Director at jewellery experts F Hinds, said: “Philip chose to design Queen Elizabeth’s ring himself using the diamonds taken from his mother’s tiara.

“For the design, he opted for an extravagant round-cut diamond sitting in between two clusters of smaller diamonds – a timeless choice.

“The stones were set into beautiful bright platinum, choosing nothing but the best for the future Queen.”

The tiara Philip had dismantled for the Queen’s ring was thought to have been given to Princess Alice as a wedding gift by Tsar Nicholas II and the Tsarina Alexandra of Russia, upon her marriage to Prince Andrew of Greece and Denmark in 1903.