Meghan Markle's and Princess Eugenie's engagement rings do not compare to Princess Diana's and Kate Middleton's in value.

Two royal engagements happened in a span of less than two months, thus Markle and Princess Eugenie were often compared. But the public is wondering who among the British royals owns the most expensive engagement ring.

To answer that concern, Queen Elizabeth II, Princess Diana, Markle, Kate Middleton and Princess Eugenie's engagement rings were compared in value. Check out whose royal engagement ring is the priciest, according to Metro.

Queen Elizabeth II

The queen's engagement ring is personally designed by Prince Philip with the help of jeweler Philip Antrobus Ltd. The band features a 3 carat "old cut" diamond set in a claw setting in platinum.

The diamond was taken from a tiara that belongs to Prince Philip's mother, Princess Alice of Greece. The ring is estimated to cost $284,168.

Princess Diana and Kate Middleton

Prince Charles gave Princess Diana a sapphire engagement ring from Garrard & Co Ltd. It was not custom-made like the other royal rings. It features 14 solitaire diamonds surrounded by Sri Lankan 12-carat oval faceted blue Ceylon sapphire and was set in 18-carat white gold.

Later on, Prince William used the same ring when he proposed to Middleton. In 1981, the ring was valued at $39,784. But at the time it is estimated to have an insurance value of $426,252.

Meghan Markle

There are different opinions when it comes to the value of the "Suits" star's engagement ring. According to Deborah Papas, a gemologist from Prestige Pawnbrokers, it has an estimated value of $70,000. However, another gem expert claimed that Prince Harry's engagement ring to Markle is worth $174, 218.

"From seeing the pictures, I would estimate that the centre diamond is a slightly elongated cushion cut diamond, approximately 3.00 - 4.00 carats. The side diamonds are more than likely oval or round cut diamonds about 0.75 carats each," the expert explained. "We would estimate that the value of the centre stone would be around £70,000 - £115,000 ($99,553 - $163,552), while the side stones would have an intrinsic value of around £3,750 ($5,333) each."

Princess Eugenie

Meanwhile, Papas claimed that Princess Eugenie's engagement ring is estimated to cost over $140,000. The pink padparadscha sapphire ring surrounded by diamonds includes the "the rarest and most valuable of all the corundum varieties."

Initially, Papas said that Princess Eugenie's ring is twice the cost of Markle's band, which is priced at $70,000. But another expert said that Markle's ring is worth over $170,000. If the second gemologist is correct, then the "Horrible Bosses" star's ring is more expensive.

However, neither Markle nor Princess Eugenie owns the most expensive ring. That one belongs to Princess Diana and Middleton, who share the same band.

Royal Family
Whose royal engagement ring is the most expensive? Pictured: Prince Charles, Princess Anne, Queen Elizabeth II, Prince Andrew, Prince Harry, Kate Middleton, PRince William, Princess Eugenie, Princess Beatrice and Prince Edward stand on the balcony at Buckingham Palace during the annual Trooping the Colour Ceremony on June 15, 2013 in London. Getty Images/Chris Jackson