When Princess Diana died in a car crash in 1997, Prince Charles reportedly allowed the brothers, Prince Harry and Prince William, to choose selected items from her jewelry collection to remember her by.
In "The Diana Story," a three-part documentary now streaming on Amazon Prime, Burrell remembers William asking for his "mummy's Cartier watch," which was gifted to her by her father John Spencer.
Meanwhile, Prince Harry requested the engagement ring Princess Diana selected upon marrying Prince Charles. Burrell recalled that Harry had strong memories of the ring, once saying: "I remember when I held mummy's hand when I was a small boy and that ring always hurt me because it was so big."
The iconic piece is a 12-carat Ceylon sapphire ring surrounded by a cluster of 14 solitaire diamonds set in 18-karat white gold. Insider's Melissa Wiley previously reported that the ring came from Garrard, which had served as the official jeweler of the monarchy since 1843.
According to Burrell, when Prince William set out to propose to his then-girlfriend Kate Middleton in 2010, it was Prince Harry's idea to offer up his mother's ring: "Harry said to him, 'Wouldn't it be fitting if she had mummy's ring?'"
"Then one day that ring will be sat on the throne of England," said Burrell in the documentary, noting that it was a "selfless" act of kindness between brothers – and one that has culminated in 10 years of marriage, as William and Kate celebrate their anniversary this week.