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The story behind Grace Kelly’s engagement ring

The iconic engagement ring of Grace Kelly

Grace Kelly’s engagement to Prince Rainier of Monaco remains one of the most iconic moments in royal and Hollywood history. At the centre of this fairy-tale romance was not just one, but two stunning engagement rings that became symbolic of her timeless elegance. From a refined Cartier eternity ring to a dazzling 12-carat diamond, these rings not only signified Grace's love story but also set trends in the world of fine jewellery. Here's a look into the details and legacy behind these famous rings.

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How did Grace Kelly's engagement ring influence her life and public perception?

Grace Kelly’s engagement ring initially given by Prince Rainier was later upgraded to a 12-carat diamond ring due to Hollywood standards. This iconic ring became popular and was featured in her final movie, "High Society." The ring symbolised her shift from actress to royalty, influencing engagement ring trends and signifying the end of her acting career.

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a reconstruction of both the iconic eternity and engagement ring from Grace Kelly, both elegantly adorned with red rubies

Prince Rainier’s first proposal: the eternity ring

When Prince Rainier of Monaco first proposed to Grace Kelly, he did so with a stunning Cartier eternity ring set with diamonds and rubies. The design, symbolic of their eternal love, was a reflection of Grace’s classic taste, as well as her burgeoning connection to Cartier, a brand she admired thanks to Alfred Hitchcock’s introduction. However, the ring, though beautiful, paled in comparison to those worn by other Hollywood starlets.

A bigger statement: the iconic 12-carat engagement ring

Noticing that other leading ladies in Hollywood were flaunting larger engagement rings, Prince Rainier decided to purchase a second ring for Grace Kelly. This new engagement ring was nothing short of magnificent – a dazzling 12-carat rectangular-cut diamond, flanked by two baguette-cut diamonds. The breathtaking ring, which became an instant style icon, was estimated to cost $4.3 million.
ring

Technical specifications and design details (reported figures)

Though many retellings call it a "12-carat" upgrade, archival records and specialist accounts more often list the central diamond at about 10.38–10.48 carats. Several reputable sources describe the centre stone as an emerald cut in that 10.38–10.48 ct range, while Vogue specifically cites a 10.48‑carat emerald‑cut Cartier diamond. The larger 12‑carat number appears in some popular accounts and likely reflects rounding or the desire to convey a bigger on-screen presence rather than a precise gemological measurement.

The ring is consistently reported as a three‑stone design: an emerald‑cut centre flanked by tapered baguette side stones. The baguettes sit in a narrowing profile that complements the long lines of the emerald cut, producing an elongated, architectural silhouette. Contemporary descriptions and Cartier references indicate the mounting was platinum, chosen for its strength and subtle sheen, a sensible match for a substantial white diamond of the period. Together, the emerald cut, tapered baguettes and platinum mount explain the clean, geometric look that made the ring so recognisable.
Grace Kelly wearing her 12-carat engagement ring in her movie ‘High Society” as her character Tracy Lord

Grace Kelly's engagement ring in "High Society"

The ring was not only significant in Grace's personal life but also had its place in her professional career. The diamond ring made its silver screen debut in her final film, “High Society”, where Grace's character, Tracy Lord, wore the very same ring as her engagement ring in the movie. This connection further fueled the ring's legendary status and helped skyrocket the popularity of similar designs, especially the emerald-cut diamond.

Where is the ring now? Provenance and exhibition history

Both of Grace Kelly’s engagement rings have remained tied to the Grimaldi family. Archival research and reporting indicate the pieces were kept within the family collection rather than placed in a permanent public museum. Cartier’s records and commentary trace transfers and occasional loans between Paris and Monaco, reflecting the maison’s long relationship with the princely household.

Commentators on Cartier’s heritage note that Princess Grace’s jewels have moved between Cartier and members of the Grimaldi family for safekeeping or display. On occasion Cartier and museum partners have included items associated with Princess Grace in curated exhibitions or retrospectives. When not on loan, the engagement rings and related heirlooms form part of the princely collection and are preserved by the family, occasionally becoming available for public viewing through authorised displays.

The fate of Grace Kelly’s wedding ring

Grace Kelly’s wedding ring, also designed by Cartier, became another piece of history. Initially, it was loaned to Cartier’s New York boutique, where it was showcased after the wedding. The ring, an eternal symbol of royal elegance, is now part of the House of Grimaldi.

Other famous royal engagement rings

Grace Kelly's rings paved the way for a new era of royal engagement jewellery, inspiring designs that continue to captivate the world. From Meghan Markle's bespoke creation and Princess Eugenie's unique ring, the influence of Grace’s remarkable taste is evident in these celebrated pieces, each telling their own story of love and legacy.

Reported valuation and price history

Contemporary press from the time reported that the larger Cartier diamond had a figure quoted at roughly four million dollars. Modern secondary sources give inflation‑adjusted and contemporary estimates that vary widely: one compilation mentions about $45 million adjusted for inflation, while specialist jewellery write‑ups often place the modern estimate in the high tens of millions, commonly reported around $38–39 million. These numbers come from secondary publications and are estimated values rather than formal appraisals. They do, however, illustrate how the ring’s original cost, rarity and provenance have led publications to assign a very high modern market estimate in public discourse.

  • Fabienne Rauw

  • BAUNAT Antwerp

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Fabienne, manager of the German market is able to guide every client with finding the right jewel. She takes care of most of the German orders, but also takes other task on her plate. Thanks to her six  years of experience at BAUNAT she acquainted well with the product and the marketing around it. Her degree in PR ensures that BAUNAT is well presented across all media channels. For anyone looking into a new investment opportunity, Fabienne is the perfect guide in this process. No question will be left unanswered, and she will help you every step of the way.