Prince Harry and Meghan Markle's royal wedding is just weeks away, but several of the biggest details remain unknown. The latest news, however, suggests the blushing bride's all-important "something borrowed."

Something Borrowed From A Familiar Source

According to a leading royal expert, princess-to-be Markle may be looking to the life of a past royal for the big day. Katie Nicholl revealed that Markle's "something borrowed" could be coming from the jewelry box of none other than the late Princess Diana.

"Harry made sure Diana wasn't forgotten on the day of his engagement. Two of the diamonds in Meghan's ring is from Diana's personal collection. So I think there's every possibility that Meghan might wear a piece from Diana's jewelry collection on her wedding day," she explained.

The ring in question includes two diamonds from Diana's collection set either side of a stone from Botswana, which is a special location for the couple.

What To Choose

As for the piece Markle might choose, Nicholls suggested that it's possibly Princess Diana's Spencer Tiara. She advised that using it might be a nice way of including Prince Harry's late mother in his big day just like his brother William did when he gave then wife-to-be Kate Middleton her engagement ring.

However, other experts reckon that it's highly unlikely Markle would choose to borrow that particular piece.

"Meghan is marrying into the Windsor family, not the Spencer family, so if she borrows a tiara, I think it will reflect her new royal status," argued jewelry writer Ella Kay.

Maybe, the princess-in-waiting could choose something a bit more different, such as Princess Diana's South Sea pearl earrings perhaps, or even her diamond and sapphire suite from the Sultan Oman, which could also coincidentally tick the "something blue."

Keeping His Mother Close

Regardless of how they choose to do it, there's no question Princess Diana will be included in the May 19 nuptials somehow.

"For Prince Harry, one of the most important and influential people of his life - his mother - will of course not be there to participate in his special day. This would be very poignant, and a very personal thing between the young couple, and it would symbolically allow his mother to be part of this magical day," said former royal butler and commentator Grant Harrold.

Princess Diana died in a car crash in 1997. Both Prince William and Prince Harry have recently discussed the grief they felt about their mother's passing.