Prince Harry and Meghan Markle’s royal wedding produced drama from start to finish.

One well-documented point of contention was the tiara the former “Suits” actress wore for her walk down the aisle in 2018.

In his forthcoming memoir, “Spare,” Prince Harry wrote that while he and Markle were “touched” by the idea of the duchess donning one of Princess Diana’s tiaras on the big day, Queen Elizabeth II begged them to select something from her private collection of jewelry at Buckingham Palace instead.

The Queen and her royal dresser, Angela Kelly, presented five tiaras from which the bride-to-be could choose, with the offerings including one of all emeralds and another with aquamarine stones.

Prince Harry said everyone agreed that one “stood out from the others” and “looked like it was made for Meg,” though he didn’t describe the winning design.

One week later, when the couple inquired with Kelly about borrowing the tiara for Markle’s test with her hairstylist — which Kate Middleton had advised was an arduous process involving sewing the veil to the headpiece and placing it in the exact right location on her head — Harry claims Kelly went silent.

When they finally got in touch with her, she said that the tiara could not leave the palace without “an ordinance and police escort,” Harry wrote. “That seemed to us a little exaggerated,” he added, but he agreed to the protocol as “time was running out.”

“It was obvious they were putting up obstacles, but why? It didn’t occur to us what motives they might have,” he said.

According to Prince Harry, there were also “heated debates” on whether or not Markle should wear a veil for their ceremony as a divorced woman.

It was previously reported that the Duchess of Sussex’s first-choice tiara was actually the emerald piece, but that the Queen “felt she had” to deny the request, as the crown had “scandal attached.”

The green tiara “was one of those that had found its way into Windsor hands through ‘undefined’ not to say dodgy channels — and for an undisclosed price — in the aftermath of the Russian Revolution,” Robert Lacey wrote in his book “Battle of Brothers.”

“Battle of Brothers” claims that Prince Harry flew into a rage when he was told Meghan could not borrow the emerald tiara.

Markle instead wore Queen Mary’s Diamond Bandeau, the centerpiece of which is a 10-diamond brooch Mary of Teck received as a wedding gift from the County of Lincoln in 1893.