Meghan Markle
Meghan Markle paid a tribute to Princess Diana and Prince Charles during her tour in Tonga. Pictured: Markle attends a state dinner at the Royal Residence on Oct. 25, 2018 in Nuku'alofa, Tonga. Getty Images/Paul Edwards

Meghan Markle continues to honor her in-laws during her and Prince Harry's Commonwealth tour.

On Thursday, the Duke and Duchess of Sussex landed at Fua'amotu Airport and headed to the Consular House in Nuku'alofa for a private meeting with King Tupou VI and Queen Nanasipau'u. Markle wore a white cap-sleeve beaded silk satin column gown designed by Theia. On the other hand, Prince Harry opted for a classic black tuxedo with a bowtie.

Aside from Markle's stunning outfit, many noticed the ring on her finger. The new royal was wearing one of the pieces from Princess Diana's jewelry collection. The bling was reportedly a gift from Prince Harry. Both Prince William and Prince Harry gifted their wives with special rings from the late Princess of Wales' collection.

The aquamarine ring that Markle used was reportedly a gift for Princess Diana in place of her engagement ring after her divorce from Prince Charles in 1996, People reported. On the other hand, the People's Princess' engagement ring is now owned by Kate Middleton. Prince William used it when he popped the big question to the Duchess of Cambridge.

Aside from paying tribute to Princess Diana, Markle didn't forget Prince Charles. According to Carly Read, a journalist of Express, the expectant mom also wears the elegant Cartier bracelet that her father-in-law, the Prince of Wales, gave to her as a wedding gift. Prince Charles and Markle had a great relationship. In fact, it was the future king who gave her away on her big day.

Princess Diana had a discretionary fund that was set up for Prince William, Prince Harry, their spouses and descendants. The assets of the estate, intellectual property rights and accumulated income were divided between the Duke of Cambridge and Duke of Sussex.

"The income earned by the fund is to be distributed among the fund's beneficiaries during the Perpetuity Period as the trustees see fit. Anything left in the fund when it expires will go to the then living descendants of Prince William and Prince Harry," the report stated.

Princess Diana also made it clear that she wanted her daughters-in-law to use her jewelry collection. She wanted those items to be equally divided between the Duke of Cambridge and Duke of Sussex, so their wives can use it.

"But I would like you to allocate all my jewelry to the share to be held by my sons, so that their wives may, in due course, have it or use it. I leave the exact division of the jewelry to your discretion," Princess Diana wrote in her Letter of Wishes, according to The Telegraph.