Grace Kelly’s engagement ring remains the blueprint for modern celebrity jewelry, even decades after her wedding. Before the current trend of massive emerald-cut stones, the 10.48-carat Cartier diamond set the standard for high-profile nuptials. Kelly, who was already an Academy Award winner, married Prince Rainier III of Monaco in 1956, blending Hollywood fame with European royalty.
The First Proposal and the Upgrade
Prince Rainier proposed twice. His first offer came in Philadelphia, where he brought a diamond and ruby eternity band to Kelly’s family home. The piece featured red and white gemstones to represent the colors of the Monaco flag. Kelly debuted this ring publicly in January 1956 during the engagement announcement, but the jewelry story did not end there.
Only a month later, the Prince presented a new, more substantial ring. This Cartier creation featured a 10.48-carat emerald-cut diamond mounted in platinum, flanked by two baguette-cut diamonds. The switch to the larger stone reflected both the grandeur expected of a princess and Kelly’s status as a major Hollywood star. At the time of the wedding, the ring was valued at $4.06 million, though it is now estimated to be worth $38.8 million.
Cartier’s Image, Style, and Heritage Director Pierre Rainero explained the history of the piece. He noted that the House of Cartier has maintained a relationship with the princely family since the early 20th century. The company provided multiple items for the wedding, including the engagement ring, which was crafted in 1956.
On November 12, Kelly would have turned 97 years old. In celebration of her birthday, discover the fascinating tale of Grace Kelly’s engagement ring, a cinematic masterpiece that became one of the most influential rings in history.
High Society and a Real Diamond on Camera
Grace Kelly filmed her final movie, High Society, in 1956 before leaving Hollywood for Monaco. The film, a remake of The Philadelphia Story, featured her in the lead role of Tracy Samantha Lord. Traditionally, film productions use replicas for prop jewelry, but Prince Rainier intervened when he learned the studio planned to outfit her with a fake diamond.
Cartier’s director Rainero stated that Grace Kelly refused to remove the ring for the film shoot, giving the jewel a starring role. After wrapping production in Los Angeles, Kelly traveled to Monaco for the civil ceremony at the palace. The couple held a lavish religious wedding at Saint Nicholas Cathedral on April 19, 1956, which was watched by over 30 million viewers worldwide.
The studio gifted Kelly her ivory lace bridal gown for the event, designed by Helen Rose. On the night of the civil ceremony, Kelly wore a Cartier diamond festoon necklace with 64 brilliant- and baguette-cut diamonds to a celebratory gala. This jewelry, paired with her engagement ring, became a permanent fixture of her public appearances.
The Royal Collection and Its Legacy
After Grace Kelly’s death, both rings entered the custody of the House of Grimaldi. The Cartier emerald-cut diamond and the original ruby band remain in the royal family’s collection. The family loans these items for special exhibitions. In 2016, Cartier displayed the jewels during the renovation of its Fifth Avenue flagship store. A dedicated room now honors Grace Kelly and her legendary pieces at the boutique.
Kelly wore the jewel and her Cartier engagement ring until her untimely death in 1982. At just 52, she suffered a stroke while driving, which led to a fatal car accident—bringing a tragic end to the life of one of Hollywood and Monaco’s most enduring icons.
