Prince Charles warned Meghan Markle to avoid wearing tiara as Kate Middleton rocked a diamond headpiece

Prince Charles warned Meghan Markle not to wear a tiara for a state dinner overseas the same night that Kate Middleton wore a diamond-emblazoned tiara at Buckingham Palace, a new report claims.

Markle, 37, reportedly requested to wear a jeweled tiara from the Royal Collection for a state dinner in Fiji with Prince Harry in October, but Prince Charles nixed the idea for fear of the Duchess of Sussex appearing "extravagant," insiders told The Daily Mail.

The same evening, for a state banquet at Buckingham Palace, Middleton, 37, wore a diamond and pearl tiara previously owned by Prince William and Harry's late mother, Princess Diana.

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"Meghan did not understand all of this because she was new to the role and so Prince Charles told her that it would not be appropriate," a source said. "It was very kindly done."

Kate Middleton at a state banquet in honor of King Willem-Alexander and Queen Maxima of the Netherlands in October 2018

Kate Middleton at a state banquet in honor of King Willem-Alexander and Queen Maxima of the Netherlands in October 2018

The source noted that Prince Charles advised Markle against the idea because of the low socioeconomic status of much of Fiji compared to the riches of the royal family.

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It reportedly wasn't the only time the former "Suits" actress was denied a luxury headpiece.

Previous reports alleged that Markle was disappointed when Queen Elizabeth II refused to let her wear an emerald tiara for her royal wedding to Prince Harry in May 2018.

Princess Eugenie at her wedding in October 2018

Princess Eugenie at her wedding in October 2018

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The jewels in the emerald tiara allegedly couldn't be traced and may have been from Russia.

The Queen instead lent Markle a diamond and platinum tiara from her own collection.

Prince Harry and Meghan Markle at their royal wedding in May 2018

Prince Harry and Meghan Markle at their royal wedding in May 2018 (AP)

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Princess Eugenie wore an emerald tiara for her own wedding in October 2018.