Prince Harry and Meghan Markle made a surprise visit to Northern Ireland on Friday as part of their pre-wedding tour of the United Kingdom.

Prince Harry and Meghan Markle, during a visit to the Crown Bar in Belfast Northern Ireland, where they learnt from National Trust representatives about the pub's heritage, and met bar staff, local comedians and musicians Friday March 23, 2018. (Gareth Fuller/Pool via AP)

Prince Harry and Meghan Markle, during a visit to the Crown Bar in Belfast Northern Ireland, where they learnt from National Trust representatives about the pub's heritage, and met bar staff, local comedians and musicians Friday March 23, 2018. (Gareth Fuller/Pool via AP)

The new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

The new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

The trip was not announced ahead of time in keeping with security procedures used for royal travel to Northern Ireland.

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Prince Harry and Meghan Markle, during a visit to the Crown Bar in Belfast Northern Ireland, where they learnt from National Trust representatives about the pub's heritage, and met bar staff, local comedians and musicians Friday March 23, 2018. (Gareth Fuller/Pool via AP)

Prince Harry and Meghan Markle made a surprise visit to Northern Ireland on Friday as part of their pre-wedding tour of the United Kingdom.

The new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

The new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

A pill box with the initials H and M which forms part of the new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

The trip was not announced ahead of time in keeping with security procedures used for royal travel to Northern Ireland.

A plate with the initials H and M which forms part of the new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

A plate with the initials H and M which forms part of the new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

Nuala Campbell, left, and Eoin Lambkin, 2nd left, from Titanic FX show Britain's Prince Harry and Meghan Markle some prosthetic limbs made by the Titanic FX company during a visit to Catalyst Inc science park in Belfast Northern Ireland where they met some of Northern Ireland's brightest young entrepreneurs. Friday March 23, 2018. The couple will marry in Windsor Castle on Saturday May 19. (Niall Carson/Pool via AP)

They had lunch at the popular Crown Liquor Saloon, a landmark in central Belfast.

(Niall Carson/Pool via AP)

(Niall Carson/Pool via AP)

(Niall Carson/Pool via AP)

(Niall Carson/Pool via AP)

Britain's Prince Harry, 2nd left, and Meghan Markle exit the Crown Bar following a visit to learn of its heritage, as they start a walkabout in Belfast Northern Ireland Friday March 23, 2018. (Peter Byrne/PA via AP)

The collection uses cornflower blue with white detailing and a gold monogram of the bride and groom's initials.

Prince Harry, right, and Meghan Markle, 2nd right, during a visit to the Crown Bar in Belfast Northern Ireland, where they learnt from National Trust representatives about the pub's heritage, and met bar staff, local comedians and musicians Friday March 23, 2018. (Gareth Fuller/Pool via AP)

Prince Harry, right, and Meghan Markle, 2nd right, during a visit to the Crown Bar in Belfast Northern Ireland, where they learnt from National Trust representatives about the pub's heritage, and met bar staff, local comedians and musicians Friday March 23, 2018. (Gareth Fuller/Pool via AP)

Britain's Prince Harry and Meghan Markle react to wellwishers during a walkabout in Belfast Northern Ireland after a visit to the Crown Bar in the city centre, Friday March 23, 2018. (Brian Lawless/PA via AP)

The china is finished in 22 carat gold. It was made by hand in Stoke-on-Trent, 160 miles (260 kilometers) northwest of London, using traditional methods.

Meghan Markle shelters from the rain under an umbrella as she waves to wellwishers during a walkabout in Belfast with Prince Harry, after a visit to the Crown Bar in the city centre on Friday March 23, 2018. (Joe Giddens/PA via AP)

Meghan Markle shelters from the rain under an umbrella as she waves to wellwishers during a walkabout in Belfast with Prince Harry, after a visit to the Crown Bar in the city centre on Friday March 23, 2018. (Joe Giddens/PA via AP)

Kensington Palace officials said the couple would meet with young people and other members of the public and would also tour some of Belfast's most popular sites.

A pill box with the initials H and M which forms part of the new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

A pill box with the initials H and M which forms part of the new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

A plate with the initials H and M which forms part of the new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

A plate with the initials H and M which forms part of the new official range of china to celebrate the future marriage of Britain's Prince Harry and Meghan Markle is displayed in The Queen's Gallery shop at Buckingham Palace, London, Wednesday, March 21, 2018. (Rick Findler/PA via AP)

They had lunch at the popular Crown Liquor Saloon, a landmark in central Belfast.

As they toured Northern Ireland, approved commemorative china marking the couple's May 19 wedding went on sale Friday.

Nuala Campbell, left, and Eoin Lambkin, 2nd left, from Titanic FX show Britain's Prince Harry and Meghan Markle some prosthetic limbs made by the Titanic FX company during a visit to Catalyst Inc science park in Belfast Northern Ireland where they met some of Northern Ireland's brightest young entrepreneurs. Friday March 23, 2018. The couple will marry in Windsor Castle on Saturday May 19. (Niall Carson/Pool via AP)

Nuala Campbell, left, and Eoin Lambkin, 2nd left, from Titanic FX show Britain's Prince Harry and Meghan Markle some prosthetic limbs made by the Titanic FX company during a visit to Catalyst Inc science park in Belfast Northern Ireland where they met some of Northern Ireland's brightest young entrepreneurs. Friday March 23, 2018. The couple will marry in Windsor Castle on Saturday May 19. (Niall Carson/Pool via AP)

(Niall Carson/Pool via AP)

(Niall Carson/Pool via AP)

(Niall Carson/Pool via AP)

(Niall Carson/Pool via AP)

The collection uses cornflower blue with white detailing and a gold monogram of the bride and groom's initials.

The design also references the couple's wedding venue at St. George's Chapel at Windsor Castle. The decorative border is based on the ironwork of the 13th century chapel door.

Britain's Prince Harry, 2nd left, and Meghan Markle exit the Crown Bar following a visit to learn of its heritage, as they start a walkabout in Belfast Northern Ireland Friday March 23, 2018. (Peter Byrne/PA via AP)

Britain's Prince Harry, 2nd left, and Meghan Markle exit the Crown Bar following a visit to learn of its heritage, as they start a walkabout in Belfast Northern Ireland Friday March 23, 2018. (Peter Byrne/PA via AP)

Prince Harry, right, and Meghan Markle, 2nd right, during a visit to the Crown Bar in Belfast Northern Ireland, where they learnt from National Trust representatives about the pub's heritage, and met bar staff, local comedians and musicians Friday March 23, 2018. (Gareth Fuller/Pool via AP)

Prince Harry, right, and Meghan Markle, 2nd right, during a visit to the Crown Bar in Belfast Northern Ireland, where they learnt from National Trust representatives about the pub's heritage, and met bar staff, local comedians and musicians Friday March 23, 2018. (Gareth Fuller/Pool via AP)

The china is finished in 22 carat gold. It was made by hand in Stoke-on-Trent, 160 miles (260 kilometers) northwest of London, using traditional methods.

Profits will go to the Royal Collection Trust charity.

Britain's Prince Harry and Meghan Markle react to wellwishers during a walkabout in Belfast Northern Ireland after a visit to the Crown Bar in the city centre, Friday March 23, 2018. (Brian Lawless/PA via AP)

Britain's Prince Harry and Meghan Markle react to wellwishers during a walkabout in Belfast Northern Ireland after a visit to the Crown Bar in the city centre, Friday March 23, 2018. (Brian Lawless/PA via AP)

Meghan Markle shelters from the rain under an umbrella as she waves to wellwishers during a walkabout in Belfast with Prince Harry, after a visit to the Crown Bar in the city centre on Friday March 23, 2018. (Joe Giddens/PA via AP)

Meghan Markle shelters from the rain under an umbrella as she waves to wellwishers during a walkabout in Belfast with Prince Harry, after a visit to the Crown Bar in the city centre on Friday March 23, 2018. (Joe Giddens/PA via AP)