Kate Middleton's wedding ring doesn’t meet all the royal standards

When Prince William proposed to Kate Middleton back in 2010, he gave her the late Princess Diana's sapphire engagement ring.

The Duchess of Cambridge has proudly worn the ring since then, despite the controversy that surrounds it when Prince Charles first proposed to Diana back in 1981.

Read more about the royal family on our Twitter account, @amomama_usa, and scroll down to learn about the history of Kate's ring.

The ring has a large Ceylon sapphire surrounded by 12 solitaire diamonds set in 18-karat white gold, and Princess Diana picked the ring herself.

It cost approximately $60,000 and the jeweler, Garrard, was inspired by a royal brooch that dates back to the mid-1800's.

Despite its price and link to royalty, many members of the royal family looked down at it for one simple reason: It wasn't one-of-a-kind.

The ring was featured in the jeweler's catalog and members of the public could purchase a similar ring if they had $60,000 lying around.

Most pieces of jewelry worn by members of the royal family are custom-designed to ensure that only one of each piece exists.

After Diana's death, her jewelry collection went to her sons, for them to give to their wives in due course. Both sons have incorporated it into their proposals.

Prince Wiliam had the sapphire ring adjusted to fit Kate and carried it around for three weeks in his backpack before asking the big question.

He proposed while the couple was on holiday in Kenya, and Prince Harry proposed to Meghan during a private dinner at Kensington Palace.

He used diamonds from his mother's collection for Meghan's ring, which he designed himself. They also included a diamond from Botswana.

Read more about the jewelry pieces Meghan, the Duchess of Sussex, wore on her wedding day. She exchanged vows with Prince Harry back in May.