Grace Kelly had two engagement rings – first was replaced despite it being 'very rare'

Oscar-winning actress Grace Kelly became Princess of Monaco when she wed Prince Rainier in Monaco’s cathedral in 1956. Iconic to this day, Grace wore a stunning long-sleeved, lace-covered dress for her religious ceremony. But what was her engagement ring like?

Rainier proposed to Grace in December 1955, asking for her hand with a beautiful engagement ring.

However, this ring is not as known among royal fans as Grace’s second – and main – engagement ring.

The second ring is the most famous one – but why were there two in the first place?

Grace’s first ring was a slim eternity band, made by Cartier, and featured heirloom red rubies and white diamonds.

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Grace’s second ring had a huge 10.5-carat emerald-cut diamond at its centre, flanked by two diamond baguette stones.

This ring is thought to be worth a huge £30million, according to Max Stone, diamond expert at jewellers Steven Stone.

Grace’s first ring, however, could be worth around £15,000.

Speaking about the lesser known first ring, Max explained: “While it’s incredibly difficult to value a ring without seeing the original item in colour, the fact that the ring was designed by Cartier and features heirloom rubies, which look to be around 1.5 carats, along with 1.5 carats of diamonds, suggests it could be worth over £15,000 today.

Starring alongside Frank Sinatra and Bing Crosby, this was Grace’s last role before becoming Princess of Monaco.

As Tracy Lord, who would marry Bing Crosby’s character Dexter in the film, Grace wore a diamond engagement ring on set.

However, after being made aware of this prop, Rainier bought Grace the real deal so she could continue wearing it after filming had ended.

After one of the most famous royal weddings of all time, Grace and Rainier went on to have three children, Princess Caroline, Prince Albert, and Princess Stephanie.

Grace carried out royal duties until she died in a car accident in 1982, when she was just 52.

Rainier died in 2005, aged 81.