Koh-i-Noor: India's most contested historic diamond

Golconda origins: the world's first great diamond region

The Koh-i-Noor originated in the Golconda region of India, the ancient diamond-producing area centred on what is now Andhra Pradesh and Telangana. The specific mine is debated by historians, but the most credible attribution is the Kollur mine on the Krishna River, which produced several of the world's most famous diamonds in the 16th and 17th centuries (Dalrymple & Anand, 2017, op. cit., p. 14–17).

The diamond is a Type IIa stone, the rarest classification in natural diamonds, indicating near-complete absence of nitrogen and producing exceptional colourless transparency. Type IIa stones are characteristic of Golconda's deepest ancient alluvial deposits and account for a disproportionate number of the world's most famous diamonds: the Koh-i-Noor, the Hope, the Regent, the Orlov, and the Sancy are all Type IIa Golconda stones (GIA Gems & Gemology, "Type IIa Diamonds," various research articles; Smithsonian Institution documentation on the Hope Diamond).

First documented ownership: the Kakatiya dynasty

The earliest documented reference to a diamond that may be the Koh-i-Noor appears in the context of the Kakatiya dynasty of Warangal (in present-day Telangana), which controlled the Golconda diamond-producing region until the early 14th century. When Malik Kafur, the general of the Delhi Sultanate's Alauddin Khalji, sacked Warangal in 1310, the treasures of the Kakatiya kingdom, including diamonds, were transferred to Delhi (Mani, S., 2021, The Koh-i-Noor, Penguin Books India, Gurugram; historical sources on Kakatiya-Delhi Sultanate conflict).

The diamond's history before Mughal records is difficult to establish with certainty. Multiple large Indian diamonds were in circulation among the sultanate courts of medieval India, and the specific identification of the Koh-i-Noor in pre-Mughal records is contested by historians. What is established: by the early 16th century, a great diamond, almost certainly the Koh-i-Noor, was a prized possession of the Mughal imperial treasury.

The Mughal era: from Babur to Aurangzeb

The most historically reliable account of the Koh-i-Noor's early history begins with the Mughal emperor Babur. In his memoirs, the Baburnama, Babur records receiving a great diamond from the family of the defeated Sultan Ibrahim Lodi after the First Battle of Panipat in 1526. He describes it as worth "the whole world's daily food", a reference scholars have used to identify it as the Koh-i-Noor (Babur, Baburnama, c.1530, as translated by Annette Beveridge, 1922; quoted in Dalrymple & Anand, 2017, op. cit., pp. 22–26).

The diamond passed through Mughal custody for more than two centuries, through Humayun, Akbar, Jahangir, Shah Jahan, and Aurangzeb. Shah Jahan, who built the Taj Mahal, incorporated the diamond into the Peacock Throne, the legendary jewelled throne constructed between 1628 and 1635 at a cost that contemporary accounts described as twice the price of the Taj Mahal itself (Tavernier, J.B., 1676, Travels in India, as translated by Valentine Ball, 1889; documentary sources on the Peacock Throne).

Jean-Baptiste Tavernier, the French gem merchant who visited the Mughal court and recorded extraordinary detail about the imperial gem collection, described the great table diamond in the Peacock Throne in his 1676 account. His description, large, high table cut, set prominently in the throne, is consistent with the Koh-i-Noor as received from earlier Mughal records (Tavernier, 1676, op. cit.).

Nadir Shah's conquest: the diamond leaves India

In 1739, the Persian emperor Nadir Shah invaded India, defeated the Mughal emperor Muhammad Shah at the Battle of Karnal, and sacked Delhi. The Peacock Throne and the accumulated treasures of the Mughal court were carried to Persia. The Koh-i-Noor was among the treasures taken.

The famous story of how Nadir Shah obtained the diamond from Muhammad Shah involves a harem concubine who told the Persian emperor that Muhammad Shah kept the great diamond hidden in the folds of his turban. Nadir Shah proposed an exchange of turbans, a gesture of brotherhood, and thus obtained the diamond. When he unwrapped the turban and saw the stone for the first time, he is said to have exclaimed "Koh-i-Noor!", Mountain of Light, giving the diamond its modern name (Dalrymple & Anand, 2017, op. cit., pp. 48–54; multiple historical sources on Nadir Shah's India campaign).

After Nadir Shah's assassination in 1747, the diamond passed to his successors and then to the Afghan Durrani dynasty, specifically to Ahmad Shah Durrani, founder of the Durrani Empire and considered the founding father of modern Afghanistan. It remained with the Afghan Durrani rulers for several decades before its final journey to the Sikh court of the Punjab.

The Sikh court: Maharaja Ranjit Singh

Maharaja Ranjit Singh, the Lion of the Punjab and founder of the Sikh Empire, acquired the Koh-i-Noor in 1813 through negotiations with the Afghan Shah Shuja Durrani, who was in exile in Lahore and needed Ranjit Singh's military support. The terms involved the Koh-i-Noor as part of the consideration for that support (Mani, 2021, op. cit., pp. 87–102; Dalrymple & Anand, 2017, op. cit., pp. 78–95).

Ranjit Singh wore the Koh-i-Noor as an armlet, mounted on his upper arm, and it became one of the defining symbols of Sikh imperial power. His court at Lahore attracted European visitors who left detailed descriptions of the diamond as displayed by the maharaja. Before his death in 1839, Ranjit Singh reportedly intended to donate the diamond to the Jagannath temple at Puri in Odisha, an intent that was not carried out in the chaos following his death (documented in Dalrymple & Anand, 2017, op. cit., pp. 95–107).

After Ranjit Singh's death, the Sikh Empire fragmented through succession conflicts and the two Anglo-Sikh Wars. Following the British victory in the Second Anglo-Sikh War, the young Maharaja Duleep Singh signed the Treaty of Lahore in 1849, transferring the Punjab and its treasures, including the Koh-i-Noor, to the British Crown.

The British Crown: arrival and initial display

The Koh-i-Noor arrived in Britain in 1850 and was presented to Queen Victoria. It was first publicly displayed at the Great Exhibition of 1851 at Crystal Palace in London, the first World's Fair. The display was considered a disappointment: the crowds who queued to see the famous diamond found it underwhelming in its existing Mughal cut, which did not display the brilliance that Western audiences expected from a diamond. Contemporary accounts described it as "dull" and "lifeless" in the Indian cutting style (historical records of the Great Exhibition 1851; documented in Dalrymple & Anand, 2017, op. cit., pp. 210–215).

The 1852 recut: reducing the Mountain of Light

Queen Victoria and Prince Albert decided the diamond should be recut to improve its brilliance. Dutch master cutter Voorzanger, working under the supervision of the Coster firm of Amsterdam, spent 38 days recutting the stone in 1852. The result reduced the diamond from approximately 186 carats (its weight on arrival from India) to 105.6 carats, a loss of approximately 43 percent of the stone's weight (Tower of London official records, Historic Royal Palaces, hrp.org.uk; documented in Dalrymple & Anand, 2017, op. cit., pp. 215–222).

The recut transformed the stone from its Indian cushion cut into an oval brilliant, a Western cutting style designed to maximise light return and brilliance. The cut improved the stone's visual performance considerably but at the cost of more than 80 carats of what had been India's greatest diamond. Many historians regard the recut as an irreversible alteration of an irreplaceable piece of Indian heritage.

The Koh-i-Noor's documented ownership timeline. It originated in India, left India with Nadir Shah's 1739 conquest, returned to the Indian subcontinent under Afghan and Sikh rule, and was transferred to Britain by the Treaty of Lahore in 1849.

India's claim to the Koh-i-Noor

India's claim to the Koh-i-Noor is the most prominent ongoing repatriation dispute in the world of historic gemstones. The Government of India has formally sought the return of the diamond on multiple occasions, most recently in diplomatic communications connected with the coronation of King Charles III in 2023. The Indian government's position is consistent: the Koh-i-Noor is Indian cultural heritage acquired through the coercion of a child sovereign under colonial conditions, and it should be returned.

The British government's response has consistently been that the Koh-i-Noor was acquired legally under the Treaty of Lahore, which was signed (however questionably) by the then-legitimate ruler of the Punjab, and that the British Museum Act 1963 prohibits the removal of objects from the British Museum's collection, a legal constraint that, while the Koh-i-Noor is in the Crown collection rather than the British Museum, reflects the broader British position on return of objects acquired during the colonial period (British government stated positions on repatriation; Historic Royal Palaces, hrp.org.uk).

The historical facts that support India's claim are substantial: the signatory was an eleven-year-old child under British supervision; the Treaty was signed under duress following military defeat; the diamond originated in India and was part of Indian royal heritage for centuries before its removal; and its transfer to Britain was part of the broader colonial extraction of Indian wealth during the annexation of the Punjab. These facts are not disputed, the dispute is about the appropriate contemporary remedy.

The Koh-i-Noor today

The Koh-i-Noor is currently set in the Coronation Crown of Queen Elizabeth The Queen Mother (now associated with King Charles III's mother's coronation regalia), on display in the Jewel House at the Tower of London. The Tower of London is managed by Historic Royal Palaces (hrp.org.uk). The diamond is part of the working Crown Jewels and was last worn publicly at the Queen Mother's funeral in 2002 (Tower of London official documentation, hrp.org.uk; Historic Royal Palaces records).

It remains one of the most visited objects in Britain, viewed by millions of visitors to the Tower of London annually. Its display case includes information about its history, though interpretations of that history, particularly regarding India's claim, have been subjects of ongoing discussion about how colonial-era acquisitions should be presented in contemporary institutions.

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