There are gemstones, and then there are legends. The Pink Diamond, known historically as the Grand Condé, belongs firmly to the latter. Weighing more than nine carats and burning with a colour so rare it has confounded scientists for centuries, this extraordinary stone has passed through the hands of French princes, queens, and revolutionaries, survived a dramatic theft, and spent decades quietly resting in one of France’s most celebrated private collections. Now, a century after its most audacious disappearance, it is poised to step once again into the light.
From 17 October 2026 to 3 January 2027, the Musée Condé at the Château de Chantilly will dedicate a special exhibition to this singular gemstone. Organised in partnership with L’ÉCOLE, School of Jewelry Arts, and supported by Van Cleef & Arpels, the show promises to be one of the most significant jewellery events in recent French cultural memory: a rare meeting of historical scholarship, advanced gemmological science, and the kind of romantic intrigue that only the most exceptional objects seem to attract.
A Gemstone Born Of Princes
© L’ÉCOLE, School of Jewelry Arts, Benjamin Chelly
To understand the Pink Diamond’s significance, one must first understand the world from which it emerged. The Condé dynasty, one of the most powerful noble families in French history, accumulated treasures that rivalled those of the Crown itself. Their collections, eventually bequeathed to the Institut de France by Henri of Orléans, Duke of Aumale, became the foundation of the Musée Condé: a museum that remains, to this day, one of the most remarkable in Europe, housing an incomparable trove of paintings, manuscripts, furniture, and objets d’art within the magnificent setting of the Château de Chantilly.
The Pink Diamond occupies a particularly distinguished place within this inheritance. According to previously unpublished archival material unearthed in preparation for the exhibition, the stone was first formally documented in 1740, in the inventory drawn up following the death of Louis Henri de Bourbon, Prince of Condé. From that moment, it became one of the most prized gemstones in the entire Condé treasury, a stone deemed worthy not merely of admiration, but of dynastic significance.
Its journey through French royal and aristocratic circles did not end there. The Pink Diamond subsequently entered the collections of Queen Marie-Amélie of Bourbon-Sicily, a woman of considerable cultural refinement who intended the stone as a gift for her grandson, Louis of Orléans, eldest son of the Duke of Aumale. Fate, however, intervened with characteristic cruelty. The prince’s untimely death meant the jewel never reached its intended recipient, and instead passed to his father, Henri of Orléans, Duke of Aumale. It was the Duke who ultimately ensured the diamond’s survival as a public treasure, bequeathing it, alongside the entirety of the Musée Condé, to the Institut de France.
The Theft That Made History
© L’ÉCOLE, School of Jewelry Arts, Benjamin Chelly
If the Pink Diamond’s noble provenance lends it grandeur, it is the extraordinary events of October 1926 that lend it mystery. In a burglary that captured the public imagination and generated considerable press coverage at the time, the diamond was stolen from the Château de Chantilly. The theft sent shockwaves through French cultural circles and triggered an investigation that would have seemed at home in the pages of a detective novel.
What followed was equally remarkable. Several weeks after the stone’s disappearance, it was recovered, hidden, with almost absurdist ingenuity, inside an apple. The image of one of France’s most storied gemstones concealed within a piece of fruit is the kind of detail that resists embellishment precisely because reality has already outpaced imagination. The Pink Diamond was returned to the museum, and the burglary passed into legend, adding yet another chapter to a biography already rich with incident.
The exhibition at Château de Chantilly revisits this dramatic episode in careful detail, drawing on investigation documents, historical photographs, press cuttings, and previously unseen archival material to reconstruct the full story of the diamond’s disappearance and return. Visitors will be invited to follow the investigation as it unfolded, from the initial discovery of the theft to the eventual recovery of the stone. Those with an appetite for France’s most captivating cultural narratives may also wish to explore the forthcoming Feasts of Chambord exhibition, another landmark event drawing on the country’s extraordinary aristocratic heritage.
A Century Later: The Science Of Secrets
What distinguishes this exhibition from a straightforward commemorative display is the depth and ambition of the research that underpins it. To mark the centenary of the 1926 theft, the Musée Condé and L’ÉCOLE, School of Jewelry Arts, undertook what they describe as an extensive interdisciplinary research project, the first of its kind for a diamond of this calibre. The results, now being revealed to the public for the first time, are genuinely revelatory.
The gemmological analysis was conducted by a team of distinguished scientists: Emmanuel Fritsch, professor emeritus of physics and gemmologist at the University of Nantes, alongside Aurélien Delaunay and Annabelle Herreweghe, director and deputy director respectively of the LFG, the French Gemmological Laboratory. Together, they brought the full battery of modern scientific technique to bear upon a stone that had, until now, been studied primarily through the lens of history rather than chemistry and physics.
The findings are significant. Most strikingly, the scientists were able to demonstrate that the Pink Diamond’s colour, that extraordinary, almost dreamlike blush that has made it so coveted across the centuries, results from rarely observed physical characteristics. In the world of gemmology, pink diamonds are already among the most scientifically intriguing of all coloured stones; the mechanisms that produce pink colouration in diamonds are poorly understood and differ markedly from those responsible for other colours. The discoveries made in the course of this research not only shed new light on the Grand Condé itself, but open up fresh perspectives on the broader history of French historic diamonds and the science of exceptional gemstones.
Alongside the optical and chemical analyses, the team employed an automated profilometer to model the diamond’s pavilion facet pattern with extraordinary precision. The resulting three-dimensional reconstruction reveals the geometry of the stone’s cut in unprecedented detail, a technical achievement that speaks to both the sophistication of contemporary gemmological science and the care with which the exhibition’s curators have approached their subject.
© L’ÉCOLE, School of Jewelry Arts, Benjamin Chelly
From Princely Splendour To Gemmological Inquiry
The exhibition is housed in two of the Château de Chantilly’s most atmospheric spaces: the Gem Cabinet and the Gallery of Psyche. Both settings are well suited to the task of bringing a jewel’s history to life. The Gem Cabinet, intimate and focused, provides the right environment for close engagement with the diamond and the scientific analyses that illuminate its properties. The Gallery of Psyche, with its celebrated Renaissance-era painted panels, offers a more expansive backdrop against which the Pink Diamond’s long history can be contemplated in full.
Throughout the exhibition, visitors will encounter a richly varied range of materials. Previously unseen archival documents sit alongside historical photographs and period press cuttings. Scientific analyses and technical displays, including the profilometer reconstructions, make the gemmological research accessible and engaging, even for those with no prior knowledge of gemstone science. Interpretive texts and displays weave together the various strands of the diamond’s biography, from its earliest documented appearance in the Condé inventory to its dramatic theft and recovery, and on to the scientific discoveries of the present day.
The curatorial team brings together complementary areas of expertise. Mathieu Deldicque, chief heritage curator and director of the Musée Condé and the Living Museum of the Horse at the Château de Chantilly, leads the project alongside Marie-Laure Cassius-Duranton, art historian and gemmologist at L’ÉCOLE, School of Jewelry Arts. Their collaboration reflects the fundamentally interdisciplinary character of the research: this is an exhibition equally at home in the worlds of art history, decorative arts, and natural science.
L’ÉCOLE And The Culture Of Jewellery
The involvement of L’ÉCOLE, School of Jewelry Arts, in this project is entirely in keeping with the institution’s broader mission. Established in 2012 with the support of Van Cleef & Arpels, L’ÉCOLE exists to introduce the public to all aspects of jewellery culture, through courses, workshops, lectures, exhibitions, publications, and podcasts. Its programmes span three principal domains: the history of jewellery, the world of gemstones, and the savoir-faire of fine jewellery craftsmanship.
With permanent addresses in Paris, Hong Kong, Shanghai, and Dubai, and a regular programme of international travelling exhibitions and courses, L’ÉCOLE School of Jewelry Arts has established itself as a genuinely global ambassador for jewellery culture. The Pink Diamond exhibition is precisely the kind of project that sits at the heart of its mission: rigorous, interdisciplinary, and genuinely illuminating, connecting the beauty of an exceptional object to the broader worlds of history, science, and culture.
The partnership with the Musée Condé is a natural one. Both institutions share a commitment to making exceptional heritage accessible to the widest possible audience, and to approaching their subjects with intellectual seriousness as well as aesthetic appreciation. For Van Cleef & Arpels, whose support has been central to L’ÉCOLE since its foundation, the exhibition is yet another expression of the Maison’s deep and longstanding engagement with the culture and history of fine jewellery. Readers drawn to the intersection of fashion history and major museum retrospectives may find equal fascination in the upcoming Gianni Versace retrospective at the Musée Maillol in Paris.
Photo: L’ÉCOLE, School of Jewelry Arts, Benjamin Chelly
A Setting Worthy Of Legends
It would be difficult to imagine a more fitting home for an exhibition of this kind. The Château de Chantilly, bequeathed to the Institut de France by the Duke of Aumale, is itself one of the great treasures of French heritage, set amidst 7,800 hectares of land within one of the largest forests in the Paris region. Its château, grounds, and Grandes Écuries form a landmark ensemble whose beauty and historical resonance have drawn visitors for generations.
The Duke of Aumale’s collections of paintings, books, and furniture remain in place, presented in accordance with his express wishes: the Institut de France has preserved this priceless heritage for over a century, ensuring the collections are maintained in their original state and kept permanently on site. The Great Stables, an 18th-century masterpiece commissioned by Louis-Henri de Bourbon, the seventh Prince of Condé, now house the Living Museum of the Horse, adding yet another dimension to an already extraordinary cultural destination.
Against this backdrop, the Pink Diamond exhibition takes on additional resonance. The stone is not merely a visitor to Chantilly; it belongs here, woven into the history of the place and the dynasty that created it. To encounter it in these rooms, surrounded by the art and archives that document the world from which it emerged, is to experience something genuinely rare: an encounter with history that is also, in its way, an encounter with beauty itself.
Visiting The Exhibition
© L’ÉCOLE, School of Jewelry Arts, Benjamin Chelly
The Pink Diamond exhibition is included in the standard time-stamped one-day ticket to the Château de Chantilly, and can be visited in the Gem Cabinet and the Gallery of Psyche. It runs from 17 October 2026 to 3 January 2027. Further information, including ticket booking, is available at chateaudechantilly.fr/en/evenement/exhibition-pink-diamond-chantilly/.
The exhibition is supported by the GRoW @ Annenberg Foundation and the Friends of the Domaine de Chantilly, whose generosity has helped make this landmark project possible.
For those who believe that the finest jewels carry within them not merely beauty but history, that a great gemstone is also a document, a witness, a survivor, the Pink Diamond exhibition at Château de Chantilly will be unmissable. A century after it was concealed inside an apple and spirited away into the night, the Grand Condé is ready, at last, to give up its secrets.
