Prince Harry is said to have “flown into a rage” when Meghan Markle was banned from wearing the tiara she wanted for their wedding day.
The future Duchess of Sussex apparently had her eye on an emerald headdress which had been in the royal family’s possession since the Russian revolution.
When the Queen found out she said no, owing to its “sensitive origins”.
The decision is said to have angered the prince ahead of the 2018 nuptials in Windsor, according to author Robert Lacey’s book Battle of Brothers: William and Harry - the Friendship and the Feuds.
The Daily Express reported Mr Lacey stated the incident involving Meghan's tiara had been "unconfirmed by the Palace, but was not denied."
He noted the Queen's apparent response of "[it] comes from Russia " was "code for sensitive origin".
He added there was "scandal attached to the tiara Meghan desired" and was "seldom, if ever, put on public display".
Instead of the first choice tiara, Meghan was loaned Queen Mary's tiara by the late Queen Elizabeth II.
It had been made for the former Queen Consort, Her late Majesty's grandmother, in 1911.
Queen Mary wore the tiara when she was crowned alongside her husband, King George V.
The entire Russian Imperial Family — including Tsar Nicholas II, was murdered in 1918 by Bolshevik revolutionaries, and some of the jewels from the Romanovs made their way to the UK.
Mr Lacey wrote: “There was scandal attached about which Tsarist princess had worn the tiara and how she had been assassinated.”
It was believed the headdress would not have put the palace or Meghan in a positive light.
Earlier this week Meghan opened up about the Queen's death for the first time in a new interview, admitting it was a "complicated time" for the family.
Speaking for a cover story in the latest edition of Variety magazine, she reflected on the time she spent with the Monarch, who died on September 8, and revealed how the royal family are coping with the loss.
She said: "There’s been such an outpouring of love and support. I’m really grateful that I was able to be with my husband to support him, especially during that time.
"What’s so beautiful is to look at the legacy that his grandmother was able to leave on so many fronts. Certainly, in terms of female leadership, she is the most shining example of what that looks like.
"I feel deep gratitude to have been able to spend time with her and get to know her. It’s been a complicated time, but my husband, ever the optimist, said, ‘Now she’s reunited with her husband.’
