King George IV State Diadem - Queen Elizabeth II Coronation Crown

King George IV State Royal Diadem

The King George IV State Diadem, frequently identified as the Diamond Diadem, occupies a unique position within the British Royal Collection. While it has spent the last two centuries as a definitive feminine symbol utilized by four Queens Consort and two Queens Regnant it was originally conceived for a male monarch. King George IV, noted for his penchant for theatrical opulence, commissioned this masterpiece in 1820 for his coronation. During the 1821 procession to Westminster Abbey, he famously wore the circlet atop a velvet hat adorned with ostrich feathers, establishing the piece as a primary emblem of Regency grandeur.

Architectural Symbolism and Composition

The diadem is a masterclass in symbolic jewelry design, favoring an open circlet form over the heavy, enclosed arches of traditional state crowns. This structure provides a lighter silhouette while maintaining a commanding presence.

• The Framework: Crafted from a combination of silver and gold, the diadem is encrusted with 1,333 brilliant-cut diamonds.
• The Pearl Border: The base is framed by two parallel rows of pearls, which enclose the intricate diamond scrollwork.
• National Emblems: The design features four crosses pattée alternating with four floral bouquets. These botanical sprays are deeply symbolic, representing the national flowers of the United Kingdom: the rose of England, the thistle of Scotland, and the shamrock of Ireland.
• The Focal Point: The center of the front cross is set with a rare 4-carat pale yellow diamond, which serves as the visual anchor for the entire composition.

A Transition of Identity

Following the reign of George IV, the diadem was never again worn by a king. It transitioned into the female line, becoming a favorite of Queen Victoria and later achieving global recognition through Queen Elizabeth II. For seventy years, this was the jewel most frequently seen by the public, as it was selected for the portraits used on postage stamps, coins, and banknotes throughout the Commonwealth.

While it is often mistaken for a coronation crown, its ceremonial role is specific: Queen Elizabeth II utilized it during the procession to her 1953 coronation, favoring its comfort and brilliance for the journey to the Abbey before exchanging it for the heavier, sacred regalia required for the religious service.

Contemporary Usage and the 2025 Record

Today, the King George IV State Diadem remains a functional piece of royal regalia rather than a static museum object. It is traditionally reserved for the State Opening of Parliament, worn during the carriage procession to and from the Palace of Westminster.

• Queen Camilla’s Tenure: In the current reign, Queen Camilla has upheld this tradition, wearing the diadem for the first State Opening of King Charles III’s reign.
• Current Context (Late 2025): As of December 2025, the diadem continues to serve as the visual bridge between the Regency era and the modern state. Most recently, it was featured in a December 2025 archival survey as a singular icon of continuity, proving that the brilliance of the original 1820 diamonds remains a unique benchmark of sovereign authority.