The wedding invitations were designed by Barnard and Westwood, who have held the Royal Warrant for Printing and Bookbinding since 1943 and have served the Royal Family ever since.
Kensington Palace said in a statement: “The invitations follow many years of royal tradition and have been made by Barnard & Westwood.
“They feature the Three-Feathered Badge of the Prince of Wales printed in gold ink.
“Lottie Small, who recently completed her apprenticeship, printed all of the invitations in a process known as die stamping, on a machine from the 1930s that she affectionately nicknamed Maude.
“Using American ink on English card, the invitations are printed in gold and black, then burnished to bring out the shine, and gilded around the edge.
“Barnard & Westwood have been making royal invitations since 1985, and Managing Director Austen Kopley said he was thrilled and honoured to be making them.”
But while some royal fans noticed what they believe to be a mistake in the printing, other keen eyed supporters noticed another detail that was slightly different to those sent out by Kate Middleton and Prince William in 2011.
Royal wedding: Meghan and Kate’s invites differ slightly
Why are Meghan Markle and Kate Middleton’s invitations different?
The invite reads: “His Royal Highness The Prince of Wales KG KT requests the pleasure of the company of……. at the marriage of His Royal Highness Prince Henry of Wales with Ms Meghan Markle at St George’s Chapel, Windsor Castle on Saturday 19th May, 2018 at 12 Noon followed by a reception at Windsor Castle.”
The invitations are similar to the ones sent out for the Duke and Duchess of Cambridge’s wedding in 2011 – although these were in a different font and were issued with the Queen’s royal cypher.
However there is one slight difference you may not have noticed in the invites.
Meghan Markle was referred to as “Ms” in the invited while in 2011, Kate Middleton was referred to as “Miss” on her wedding invites.
But this is not down to royal preferences as one may initially think – in fact the royals are following etiquette rules.
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Because Meghan is divorced, the correct way to address her is with the title Ms – while Kate was unmarried before she wed William and so must be referred to as Miss.
Another difference is the choice of names on the invite – while Britain lovingly refers to the Duchess of Cambridge as Kate, her invitations were made out for Catherine.
But members of the public may not realise that Meghan is not her real name and that it is actually Rachel, despite Meghan appearing on the invites.
British etiquette expert Grant Harrold told Good Housekeeping: “Buckingham Palace does things by the book, so they will list your full name.
“Even though it’s an official occasion, they’ve obviously decided that she’s known to as everybody as Meghan Markle and issued the invitations under that name.”
Prince Harry’s name Henry is included on the invitation as Prince Henry of Wales.
Many also noticed that it is Prince Charles sending the invitations as opposed to the Queen, due to it being a wedding that is not a state occasion.
American bride-to-be Meghan worked as a calligrapher while trying to pay bills as she auditioned for acting roles.
But the names of invited guests were added later by a calligraphy printer, Kensington Palace said.
The dress code for the day says male guests should wear uniform, a morning coat or lounge suit and for women a day dress with a hat.
Harry, a former solder who is now Captain General of Royal Marines, may therefore be in uniform for the ceremony.