The Greville Tiara is a kokoshnik-style diamond tiara created by the Parisian house of Boucheron in 1921 for Margaret Helen Greville, one of Edwardian and inter-war Britain's most formidable society hostesses. Constructed in platinum and set throughout with brilliant-cut diamonds arranged in a distinctive honeycomb lattice, the piece stands as one of the finest surviving examples of early Art Deco jewellery design and remains among the most recognisable tiaras in the British Royal Collection. Its passage from a private collector of extraordinary taste to the British Crown — by way of a celebrated bequest in 1942 — gives it a provenance that is as historically resonant as its visual impact.

Margaret Greville: The Woman Behind the Jewel

To understand the Greville Tiara is first to understand its original owner. Margaret Helen Greville (1863–1942) was the illegitimate daughter of William McEwan, the Scottish brewing magnate and Liberal Member of Parliament who founded the McEwan's brewery empire in Edinburgh. Inheriting a very considerable fortune, she married the Hon. Ronald Greville in 1891 and thereafter devoted much of her wealth and considerable social intelligence to cultivating friendships at the highest levels of European royalty and British aristocracy. Her country house, Polesden Lacey in Surrey — now a National Trust property — served as the backdrop for some of the most glittering house parties of the Edwardian era, attended by King Edward VII, Kaiser Wilhelm II, and, in 1923, the future King George VI and Lady Elizabeth Bowes-Lyon, who honeymooned there.

Mrs Greville was a collector of serious ambition. Her jewellery holdings, assembled over four decades, were acquired from the foremost houses of London and Paris and included pieces of Indian, Russian, and French imperial provenance. She was a client of Cartier, Van Cleef & Arpels, and Boucheron, and she wore her collection with the deliberate theatricality of a woman who understood jewellery as both aesthetic object and social instrument. The tiara she commissioned from Boucheron in 1921 was the centrepiece of that collection.

Boucheron and the Commission of 1921

The house of Boucheron, founded by Frédéric Boucheron in Paris in 1858 and long established at Place Vendôme, was by the early 1920s at the forefront of the transition from Edwardian garland-style jewellery to the more geometric vocabulary that would define Art Deco. The tiara commissioned by Mrs Greville in 1921 reflects this transitional moment with particular clarity: it retains the grand scale and diamond profusion of the Edwardian kokoshnik tradition — itself derived from the fan-shaped headdresses of Russian peasant dress, popularised in European court jewellery following the marriage of Princess Alexandra of Denmark into the British royal family in 1863 — while imposing upon that silhouette a rigorous geometric order entirely characteristic of the new decade.

The defining structural element is the honeycomb lattice: a repeating pattern of hexagonal cells, each outlined in platinum and filled with brilliant-cut diamonds, that rises across the full breadth of the tiara's curved front. The hexagonal motif was not merely decorative. In the context of Art Deco design, the regular polygon carried associations of rational order, mathematical precision, and the machine aesthetic that the movement admired. That Boucheron chose the hexagon — the most efficient space-filling polygon in plane geometry, the form that bees construct by instinct — gave the piece a quiet intellectual coherence beneath its dazzling surface. The diamonds themselves are set in a manner that maximises light return: the platinum mounts are kept as fine as structural integrity permits, allowing the stones to dominate the visual field and to create, across the honeycomb ground, an unbroken shimmer of white light.

The tiara is designed to be worn in the kokoshnik manner: rising from the forehead in a broad, slightly curved band that frames the face without the vertical height of a more traditional crown. This format, which had been popularised at the Russian and British courts in the late nineteenth century, suited Mrs Greville's preference for jewellery of commanding presence worn with confidence.

Art Deco Design in Context

The Greville Tiara was created at a moment when Parisian jewellery design was undergoing one of its most consequential transformations. The years immediately following the First World War saw a decisive move away from the curvilinear naturalism of Art Nouveau and the delicate floral garlands of the Edwardian period toward a design language characterised by geometric abstraction, strong contrasts, and a preference for platinum as the dominant metal. The Exposition Internationale des Arts Décoratifs et Industriels Modernes, held in Paris in 1925, would give the movement its retrospective name, but the aesthetic was already fully formed by the early 1920s.

Within this context, the Greville Tiara occupies a specific position. It is not an experimental or avant-garde piece — Mrs Greville's tastes ran to the magnificent rather than the radical — but it applies the geometric vocabulary of Art Deco with a sureness and a scale that few comparable pieces match. The honeycomb pattern, executed across a broad kokoshnik form in the finest diamonds available, represents the Art Deco sensibility at its most assured: disciplined in structure, lavish in material, and entirely resolved as a composition. Comparable pieces from the period — Cartier's geometric bandeau tiaras, the diamond lattice work of Van Cleef & Arpels — share the same formal language, but the Greville Tiara's combination of scale, pattern, and material quality places it among the most significant surviving examples of the genre.

The Greville Bequest and Entry into the Royal Collection

Margaret Greville died on 15 September 1942, at the Dorchester Hotel in London, where she had been living since the outbreak of the Second World War rendered Polesden Lacey impractical as a residence. Her will, which had been carefully considered over many years, directed that the greater part of her jewellery collection be left to Queen Elizabeth, consort of King George VI and the woman who, nineteen years earlier, had honeymooned at Polesden Lacey. The bequest was one of the most significant private transfers of jewellery to the British Crown in the twentieth century.

The collection that passed to Queen Elizabeth included not only the Greville Tiara but a remarkable group of pieces: a diamond and ruby necklace of Indian character, a series of important brooches, and several other diamond pieces of the first quality. The total value of the jewellery bequest was estimated at the time to be in the region of several hundred thousand pounds — an extraordinary sum in wartime conditions. Mrs Greville also left Polesden Lacey and its contents to the National Trust.

The motivations behind the bequest have been the subject of some historical discussion. Mrs Greville and Queen Elizabeth had maintained a warm friendship for two decades, and the Queen had visited her during her final illness. There was also, perhaps, an element of dynastic ambition in Mrs Greville's thinking: by placing her collection in royal hands, she ensured its preservation and its continued visibility at the highest levels of public life. Whatever the precise calculation, the result was that a collection assembled by one of the most discerning private collectors of the early twentieth century passed intact into an institution capable of maintaining and displaying it indefinitely.

The Queen Mother and Subsequent Royal Wear

Queen Elizabeth — who became Queen Elizabeth The Queen Mother following the accession of her daughter in 1952 — wore the Greville Tiara on a number of public occasions and was photographed in it during the post-war decades. The piece suited her well: its broad, low profile and brilliant diamond surface complemented the style of jewellery she favoured, and its Art Deco geometry sat comfortably alongside the other major pieces in her collection, several of which shared the same period and aesthetic.

Following the Queen Mother's death in 2002, the jewellery she had received under the Greville bequest passed, along with the rest of her personal collection, to her daughter Queen Elizabeth II, and thence into the broader management of the Royal Collection. The Greville Tiara subsequently came to be worn by Camilla, Duchess of Cornwall — now Queen Camilla, consort of King Charles III — who has appeared in the piece on several notable occasions, including state banquets and formal evening events. The tiara's reappearance on the public stage in the twenty-first century has renewed interest in its history and in the remarkable woman who commissioned it.

Gemmological Character

The diamonds set in the Greville Tiara are, by all accounts consistent with pieces of this period and provenance, of high colour and clarity grades, selected for their ability to perform uniformly across the honeycomb ground. Boucheron's workshop practice in the early 1920s — like that of the other leading Parisian houses — prioritised matching: stones within a single piece were chosen and arranged so that no individual diamond drew attention to itself at the expense of the overall composition. The effect sought was one of continuous, even brilliance rather than the isolated sparkle of a single exceptional stone.

The setting metal is platinum, which had become the dominant choice for fine diamond jewellery in the years following the First World War. Platinum's strength relative to gold allowed the Boucheron craftsmen to construct the honeycomb framework with minimal metal mass, keeping the mounts as visually recessive as possible and allowing the diamonds to occupy the maximum proportion of each hexagonal cell. The result is a piece in which the structural logic of the design and the optical properties of the stones are in complete alignment: the geometry organises the light, and the light justifies the geometry.

No detailed published gemological report on the individual stones in the Greville Tiara is available in the public domain, as is standard for pieces held in private royal collections. The overall diamond weight has not been officially published, though the piece's scale and density of setting suggest a total carat weight running to several hundred carats across the full tiara.

The Greville Tiara in the Broader Context of Royal Tiaras

The British Royal Collection contains a number of tiaras of the first historical and aesthetic importance — the Girls of Great Britain and Ireland Tiara, the Vladimir Tiara, the Lover's Knot Tiara, the Cartier Halo Tiara — and the Greville Tiara holds a distinct position within that company. Unlike pieces that entered the collection through dynastic inheritance or royal commission, it arrived as a private bequest, carrying with it the personality and collecting intelligence of its original owner. This gives it a slightly different character from tiaras that were made for or by the Crown: it is, in a sense, a piece of private connoisseurship that became public patrimony.

Its Art Deco date also distinguishes it within the collection. Many of the most celebrated royal tiaras are of Victorian or Edwardian manufacture, reflecting the periods of greatest tiara-wearing in European court life. The Greville Tiara, made in 1921, represents the moment when that tradition encountered modernism — and the result, in this instance, was a piece that managed to be both thoroughly of its time and entirely timeless in its effect.

Polesden Lacey and the Greville Legacy

The physical setting in which Mrs Greville wore the tiara — Polesden Lacey, her Regency villa in the Surrey Hills — is now managed by the National Trust and open to the public. The house retains much of its Edwardian and inter-war character, and the collections it contains, including photographs of Mrs Greville in her jewellery, provide a vivid context for understanding how pieces like the Greville Tiara were worn and displayed in their original social setting. The National Trust's stewardship of Polesden Lacey has ensured that the story of Margaret Greville — her rise, her collecting, her friendships, and her bequest — remains accessible to a broad public audience, complementing the visibility the tiara itself continues to enjoy through royal wear.

Further Reading

• Royal Collection Trust — The Greville Bequest
• National Trust — Polesden Lacey
• GIA Gems & Gemology — Art Deco Jewellery