Prince William and Kate Middleton
Prince William's third-anniversary wedding gift to Kate Middleton was inspired by Princess Diana. Pictured: Middleton and Prince William attend the Men's Singles final on day thirteen of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 15, 2018 in London. Getty Images/Clive Brunskill

Prince William's choice of presents to wife, Kate Middleton, was influenced by his late mom, Princess Diana.

The Duke of Cambridge gifted Middleton a Ballon Bleu de Cartier watch worth $7,650 for their third wedding anniversary. According to Emily Hodgkin, a journalist for Express, the priceless gift was inspired by the late Princess of Wales.

Princess Diana has a penchant for Cartier watches. In fact, Prince William's mom was spotted wearing a gold Cartier Tank Francaise watch, which retailed at around $7,969. The classic watch has a square face and gold bracelet style strap. It was reportedly a present from her father, John Spencer.

When Prince Harry and Prince William were asked to take a piece of jewelry from Princess Diana's collection, the Duke of Cambridge chose her mom's watch. On the other hand, the Duke of Sussex opted for Princess Diana's sapphire and diamond engagement ring. However, the bling ended up in Middleton's hands.

Prince William and Prince Harry reportedly agreed to give their mom's engagement ring to whoever between them proposes first. The older royal proposed to Middleton in 2011 and used the ring.

Aside from these items, Princess Diana left Prince William and Prince Harry a small fortune that reportedly amounted to around $17,000,000. They received a portion of it when they were 25 and the full amount when they turned 30 years old. According to royal advisors, the inheritance had increased to $26,000,000 by the time it was given to the princes.

In the past interview, Prince William confessed that he regrets his last phone call with their mom. According to him, if he only knew that it would be their last he would not have been in a hurry to hang up.

Meanwhile, Prince Harry felt bad with the press. He blamed the paparazzi for the automobile accident that killed their mom. He was also displeased that instead of helping Princess Diana following the incident, they opted to get photos of her.

"She had quite a severe head injury but she was very much still alive on the back seat. And those people that caused the accident, instead of helping, they were taking photographs on the back seat, and then those photographs made their way back to news desks," Prince Harry said.