The Crown of Queen Elizabeth The Queen Mother is one of the most celebrated pieces of royal regalia in the world, a platinum coronation crown commissioned in 1937 for Elizabeth Bowes-Lyon, consort of King George VI, and set with approximately 2,800 diamonds including, as its supreme centrepiece, the Koh-i-Noor — a historic Indian diamond of 105.6 carats that ranks among the most storied gemstones in recorded history. Made by the Crown Jeweller Garrard & Co., the crown represents the apogee of early twentieth-century British royal jewellery craft: restrained in silhouette, extraordinary in material, and laden with dynastic significance that extends far beyond its considerable intrinsic value. It is held in the Jewel House at the Tower of London, where it has remained since the death of Queen Elizabeth The Queen Mother in March 2002.

Commission and Making

When George VI acceded to the throne in December 1936 following the abdication of his brother Edward VIII, the coronation was set for 12 May 1937. A new crown was required for the Queen Consort, and the commission fell to Garrard & Co., the London firm that had held the appointment of Crown Jeweller since 1843. The choice of platinum as the primary metal was deliberate and modern: platinum had by the 1930s become the prestige metal of choice for fine diamond jewellery, prized for its strength, its near-white colour that does not cast any warm reflection into colourless stones, and its ability to be worked into exceptionally fine, almost wire-like settings that maximise the visual weight of the diamonds themselves. The crown was the first in the British royal collection to be made entirely of platinum.

The design follows the traditional form of a consort's crown: a circlet base rising to four arches that meet at a monde and cross. The arches and circlet are encrusted with brilliant-cut and rose-cut diamonds set in a continuous field of platinum, creating a surface that reads as an unbroken shimmer of white light. The overall effect is deliberately luminous rather than colourful — a calculated departure from the ruby, emerald, and sapphire-set crowns of earlier centuries, and one that places the Koh-i-Noor in undisputed visual command.

The Koh-i-Noor: History and Transfer

The Koh-i-Noor — from the Persian koh-i-noor, meaning "mountain of light" — is a diamond whose documented history stretches back at least to the early seventeenth century in the Deccan sultanates of India, though claims of earlier provenance are contested. It passed through the hands of Mughal emperors, Persian conquerors, Afghan rulers, and Sikh maharajas before being ceded to the British Crown following the annexation of the Punjab in 1849, when it was formally presented to Queen Victoria. The stone weighed approximately 186 old carats at that time; in 1852, at the instruction of Prince Albert, it was recut by the Amsterdam firm of Coster into a modified brilliant of 105.6 carats, a reduction of nearly half its mass, undertaken to improve its brilliance according to contemporary European taste. The recut stone was subsequently mounted in a series of royal pieces.

For the 1937 coronation, the Koh-i-Noor was transferred from Queen Mary's Crown — the coronation crown made for Mary of Teck in 1911 — into the new crown for Queen Elizabeth. The transfer was achieved by means of a detachable platinum cross pattée, the topmost of the four cross-shaped ornaments that surmount the arches. This cross pattée was designed as a removable brooch mount, allowing the Koh-i-Noor to be worn separately as a pendant or brooch — a practical concession to the stone's enormous sentimental and monetary value, and a tradition of versatility that had characterised its British royal settings since the Victorian era. In its cross pattée mount, the diamond sits in a collet of platinum, its table facet uppermost, surrounded by a border of smaller brilliant-cut diamonds that frame without competing.

The Koh-i-Noor's 105.6-carat weight places it among the largest faceted diamonds in the world, though its cut — a broad, shallow oval modified brilliant — means its face-up appearance is considerably more expansive than its carat weight alone would suggest. Gemmological assessments have historically described its colour as falling in the near-colourless to faint range, with clarity characteristics consistent with a natural diamond of Indian alluvial origin. No modern laboratory grading report from GIA or any other major laboratory has been published for the stone, as it has not left royal custody for independent assessment.

The Remaining Diamonds: Quantity and Character

Beyond the Koh-i-Noor, the crown is set with approximately 2,800 diamonds of varying cuts and sizes. These include brilliant-cut stones of several sizes distributed across the arches and circlet, rose-cut diamonds used in areas of finer detail, and briolette-cut stones deployed as drops or accent elements in certain sections of the design. The use of multiple cuts in a single piece was characteristic of Garrard's work in this period and reflects the practice of incorporating existing stones from the royal collection — stones recut or remounted from earlier pieces — alongside newly acquired material. The precise provenance of each component diamond is not publicly documented, though it is known that several stones were drawn from earlier royal jewels.

The aggregate visual effect of nearly three thousand diamonds in a platinum setting is one of extraordinary brilliance: the crown appears to generate its own light under even modest illumination, a quality that made it particularly effective under the arc lights and newsreel cameras of the 1937 coronation ceremony at Westminster Abbey.

Coronation and Subsequent Use

Queen Elizabeth wore the crown at the coronation of George VI on 12 May 1937 at Westminster Abbey. It was placed on her head by the Archbishop of Canterbury, Cosmo Gordon Lang, in the ceremony of coronation of the Queen Consort that forms part of the broader coronation rite. Contemporary accounts and photographs record the crown's striking appearance: its all-white palette contrasting with the crimson and gold of the ceremonial robes and the ancient stone of the Abbey interior.

Following the coronation, the crown was worn by Queen Elizabeth on a small number of state occasions during the reign of George VI, which lasted until the King's death in February 1952. After the accession of Queen Elizabeth II, the Queen Mother — as she was now styled — had no occasion to wear a consort's crown, and the piece passed into the care of the Tower of London. It was displayed to the public as part of the Crown Jewels collection, where it has remained one of the most visited objects in the Jewel House.

When Queen Elizabeth The Queen Mother died on 30 March 2002, her coffin lay in state in Westminster Hall. The crown was placed on the coffin for the lying-in-state and the funeral procession — a deeply resonant final appearance for a piece so intimately associated with her public life. Since that occasion, the crown has not been worn and there are no current plans for its use in any future coronation, as the Koh-i-Noor's ownership is the subject of ongoing diplomatic claims by India, Pakistan, Afghanistan, and Iran, each of which has at various points asserted a historical right to the stone.

The Koh-i-Noor and Ownership Controversy

The question of the Koh-i-Noor's ownership is among the most persistent and politically charged disputes in the history of gemstones. The governments of India and Pakistan have each made formal requests for the diamond's return, arguing that its transfer to the British Crown in 1849 was made under conditions of colonial coercion rather than genuine consent. Afghanistan and Iran have also advanced historical claims based on earlier periods of the stone's custody. The British government's consistent position has been that the Koh-i-Noor was acquired legally under the terms of the Last Treaty of Lahore and that it cannot be returned under the terms of the Museums and Galleries Act 1992 and the British Museum Act 1963, which prohibit the deaccession of objects from national collections.

These claims became particularly prominent in the context of the coronation of King Charles III in May 2023, when it was confirmed that the Koh-i-Noor would not be worn by Queen Camilla at her coronation. Instead, Queen Mary's Crown — reset with the Cullinan III, IV, and V diamonds — was used. The decision was widely interpreted as a gesture of diplomatic sensitivity, though no formal change in the British government's legal position on ownership was announced.

Gemmological Significance

From a purely gemmological standpoint, the Crown of Queen Elizabeth The Queen Mother is significant on several levels. It is a primary example of the use of platinum in royal regalia — a material that, while commonplace in fine jewellery by the 1930s, had not previously been employed for a British coronation crown. The choice reflects the broader shift in fine jewellery away from yellow gold and silver-topped gold mounts toward platinum that characterised the Edwardian and Art Deco periods, driven by the metal's superior hardness, its resistance to wear, and its optical neutrality with colourless diamonds.

The Koh-i-Noor itself is gemmologically notable as one of the few surviving large diamonds of Indian alluvial origin to remain in a single piece and in continuous documented custody. Indian alluvial diamonds — recovered from the river gravels of the Golconda region in what is now Andhra Pradesh and Telangana — are distinguished by their formation in a geological environment that produced stones of exceptional clarity and a characteristic near-colourless to faintly warm transparency. The Golconda appellation, while not formally defined by any laboratory grading standard, is widely used in the trade to denote diamonds of this origin and character, and commands a significant premium at auction. Whether the Koh-i-Noor would meet the informal criteria for a Golconda designation under modern laboratory assessment is unknown, as it has never been submitted for independent grading.

The 1852 recut by Coster of Amsterdam reduced the stone from approximately 186 carats to 105.6 carats, a loss of nearly 43 per cent of the original mass. This was not unusual for the period: Victorian lapidaries routinely recut Indian and Brazilian diamonds to conform to the proportions then considered optimal for brilliance, often at the cost of significant weight. The resulting stone, while considerably lighter, was judged by contemporaries to show markedly improved fire and brilliance, though modern gemmologists have noted that the cut proportions would not be considered ideal by current standards.

Current Status and Public Access

The Crown of Queen Elizabeth The Queen Mother is displayed in the Jewel House at the Tower of London as part of the Crown Jewels collection, which is administered by Historic Royal Palaces. It is one of the most viewed objects in the collection, attracting particular attention both for the Koh-i-Noor and for its historical associations with the widely beloved figure of Queen Elizabeth The Queen Mother. The crown is displayed in a climate-controlled case under controlled lighting designed to show the diamonds to best advantage while minimising photochemical degradation of the metal and any organic components of the setting.

No comprehensive gemmological survey of the crown's diamonds has been published in the open literature, and the piece has not been the subject of a formal GIA or other laboratory assessment. Its documentation exists primarily in the records of the Royal Collection Trust and in the historical archives of Garrard & Co., portions of which are held at the Victoria and Albert Museum.

Further Reading

• GIA — The Koh-i-Noor Diamond
• Historic Royal Palaces — The Crown Jewels, Tower of London