Prince Harry says Meghan Markle and Princess Diana 'would have probably been best friends'

Prince Harry discussed his late mother, Princess Diana, in his first sit-down interview next to his new fiancée Meghan Markle on Monday.

The couple, whose engagement was announced on Monday morning, sat down with the BBC's Mishal Husain to discuss their relationship, his proposal and their plans going forward as a couple before the conversation turned to Harry's mother.

SEE ALSO: Prince Harry and Meghan Markle reveal how Harry proposed during BBC interview

Responding to a question about his inclusion of two stones from Diana's jewelry collection on Markle's engagement ring, which he designed himself, Harry explained that the decision was to "make sure that she's with us on this crazy journey together."

Diana died in a car crash in Paris on August 31, 1997. The royal family -- and the world -- commemorated the 20th anniversary of her tragic death earlier this year.

27 PHOTOS
Prince Harry and Meghan Markle engagement photo call
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Prince Harry and Meghan Markle engagement photo call
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Meghan Markle with her engagemnt ring during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Britain's Prince Harry stands with his fianc� US actress Meghan Markle as she shows off her engagement ring whilst they pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Prince Harry and Meghan Markle at a photocall to announce their engagement at Kensington Palace, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Prince Harry and Meghan Markle at a photocall to announce their engagement at Kensington Palace, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Prince Harry and Meghan Markle at a photocall to announce their engagement at Kensington Palace, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Prince Harry and Meghan Markle at a photocall to announce their engagement at Kensington Palace, London. Photo credit should read: Doug Peters/EMPICS Entertainment
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
US actress Meghan Markle shows reacts as she poses with her fianc� Britain's Prince Harry in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle arrive to pose for photographs in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and actress Meghan Markle during an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Chris Jackson/Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince Harry stands with his fianc� US actress Meghan Markle as she shows off her engagement ring whilst they pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Prince Harry and Meghan Markle in the Sunken Garden at Kensington Palace, London, after the announcement of their engagement. (Photo by Dominic Lipinski/PA Images via Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Mark Cuthbert/UK Press via Getty Images)
Britain's Prince Harry and his fianc� US actress Meghan Markle pose for a photograph in the Sunken Garden at Kensington Palace in west London on November 27, 2017, following the announcement of their engagement. Britain's Prince Harry will marry his US actress girlfriend Meghan Markle early next year after the couple became engaged earlier this month, Clarence House announced on Monday. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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Husain then asked Markle what it meant that Harry decided to connect her to his beloved mother.

"I think everything about Harry's thoughtfulness and the inclusion of [these stones] and obviously not being able to meet his mom, it's so important to me to know that she's a part of this with us," she explained. "And I think in being able to meet his aunts and different people who were important to his mom, I'm able to know a part of her through them and, of course, through him. It's incredibly special." 

SEE ALSO: Prince Harry and Meghan Markle's engagement: Celebrities react!

Additionally, Harry revealed that he thinks his mother would've adored the woman he's chosen to spend the rest of his life with. 

"They'd be thick as thieves, without question," Harry said with a smile. "She'd be over the moon jumping up and down so excited for me. [She] would've been best friends with Meghan."

23 PHOTOS
Princess Diana with her sons
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Princess Diana with her sons
VENICE, ITALY - MAY 5: (FILE PHOTO) (L-R) Diana the Princess of Wales holds her son Harry, whilst looking at Prince William held by his father Prince Charles on May 5, 1985 in Venice, Italy. Prince William will celebrate his 21st birthday on June 21, 2003. (Photo by Georges de Keerle/Getty Images)
Princes William and Harry with their mother, Diana, Princess of Wales (1961 - 1997) in the garden of Highgrove House in Gloucestershire, 18th July 1986. William is wearing a Dallas Cowboys t-shirt.(Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana At Highgrove With Prince William And Prince Harry Dressed In Miniature Parachute Regiment Uniforms And Playing On Their Slide In The Garden (Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana With Her Sons Prince William And Prince Harry Playing With A Playhouse In The Garden Of Their Home Highgrove (Photo by Tim Graham/Getty Images)
The Prince and Princess of Wales on holiday with their children, Princes William and Harry, at the Spanish royal residence Marivent Palace, August 1987. (Photo by Terry Fincher/Getty Images)
The Princess of Wales arriving at Aberdeen airport with her sons William and Harry for a holiday at Balmoral Castle, August 1986. Princess Diana is wearing a polo motive sweater by Mondi. (Photo by Jayne Fincher/Getty Images)
UNITED KINGDOM - DECEMBER 01: Prince Charles, Prince of Wales and Diana, Princess of Wales at home in Kensington Palace with their sons Prince William and Prince Harry (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 16: Princess Diana And Prince William Leaving After Delivering Prince Harry To Mrs. Mynor's Nursery School. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JUNE 11: Diana, Princess Of Wales, Holding A Young Prince Harry In Her Arms As She Watches Trooping The Colour With Prince William And Princess Margaret From The Balcony Of Buckingham Palace. (Photo by Tim Graham/Getty Images)
BALMORAL, SCOTLAND - AUGUST 18: Diana, Princess of Wales, and Prince Harry play on the banks of the River Dee, near Balmoral Castle.during a Summer vacation, on August 18, 1987, in Balmoral, Scotland. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, with Prince Harry ( centre ), and her Niece's and Nephew's on holiday on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
BATH - MAY 30: (FILE PHOTO) Prince William, Diana, Princess of Wales, Prince Harry and Charles, Prince of Wales, attend the wedding of the Duke of Hussey's daughter in May, 1989 in Bath, England. (Photo by Anwar Hussein/Getty Images)
LONDON - SEPTEMBER 12: (FILE PHOTO) Princess Diana with her sons Prince William and Prince Harry at Wetherby School on September 12, 1989 in London, England. It is Prince Harry's first day at school. (Photo by Anwar Hussein/Getty Images)
Diana, The Princess Of Wales Takes Her Sons, Prince'S William, And Harry Out On The Boat ' Maid Of The Mist ' To View Niagara Falls. (Photo by Julian Parker/UK Press via Getty Images)
CHERTSEY, UNITED KINGDOM - APRIL 18: Diana, Princess of Wales, with Prince Harry, on the Depth Charge ride at Thorpe Park, Theme Park, on April 18, 1992 in Chertsey United Kingdom . (Photo by Julian Parker/UK Press via Getty Images)
LECH, AUSTRIA - APRIL 10: Princess Diana With Princes William & Harry Skiing In Lech, Austria (Photo by Tim Graham/Getty Images)
Diana Princess Of Wales, Prince William & Prince Harry Visit The 'Thorpe Park' Amusement Park. (Photo by Julian Parker/UK Press via Getty Images)
AUSTRIA - MARCH 30: Lech: Princess Diana, sons William and Harry going to restaurant in calash In Lech, Austria On March 30, 1993. (Photo by Laurent SOLA/Gamma-Rapho via Getty Images)
LECH, AUSTRIA - MARCH 27: Princess Diana With Prince William & Prince Harry In Sleigh During Ski Holiday In Lech, Austria. Behind Are Diana's Friends Kate Menzies And Catherine Soames (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - AUGUST 19: Princess Diana, Prince Harry [ Waving ] And Prince William Watching The Parade Of Veterans On V J Day, The Mall, London. Designer Of Diana's Suit - Tomasz Starzewski (please Check - People Magazine, 04/12/1999) (Photo by Tim Graham/Getty Images)
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess holding Prince William whilst pregnant with Prince Harry, and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess and Prince Harry on holiday and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
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Despite the kind words, the joyous occasion comes with a tinge of sadness for Harry, who expressed his desire to have his mother there for such a monumental life moment for him.

"[It's] days like today when I really miss having her around but with the ring and everything else that's going on she's with us," he finished.

Meghan Markle and Prince Harry are scheduled to get married in the spring of 2018 and have been dating since July 2016.

Watch the full interview below:
 

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