India was the world’s exclusive source of diamonds for over two millennia, until the discovery of deposits in Brazil (1725) and South Africa (1867). Known in Sanskrit as Vajra (meaning thunderbolt or indestructible), the diamond held a central place in Indian cosmology, economy, and statecraft.
- Earliest Records: The Arthashastra of Kautilya (4th Century BCE) provides the first detailed classification of diamonds, categorizing them based on their luster, shape, and source.
- Ratnaprakash: Ancient Indian texts categorized diamonds into four grades based on the Varna system (purity/color), though this was an aesthetic and social classification rather than a mineralogical one.
- Global Monopoly: Roman naturalist Pliny the Elder (1st Century CE) remarked on the “diamonds of India,” noting they were the most valuable of all human possessions.
The Golconda Legend and the Krishna River Basin
The term “Golconda Diamond” does not refer to a specific mine but rather to the fortress city of Golconda (Hyderabad), which served as the primary trading hub for diamonds mined in the surrounding Krishna and Penner river basins.
- Kollur Mine: Located in the Guntur district of Andhra Pradesh, it was one of the most productive mines in the world during the 16th and 17th centuries. It is the recorded source of the Koh-i-Noor and the Hope Diamond.
- Alluvial Mining: Unlike modern deep-shaft mining, ancient and medieval Indian diamonds were largely “alluvial,” meaning they were recovered from riverbed gravels and surface deposits.
- Foreign Accounts: Jean-Baptiste Tavernier, a French gem merchant, visited India six times in the 17th century. His journals provided the West with the first technical descriptions of the Indian diamond mines at Kollur and Ramallakota.
Geographic Distribution of Diamond Deposits
Historically, diamond mining in India was concentrated in three distinct geological regions:
| Region | Primary Mining Hubs | Notable Diamonds Sourced |
| The Southern Group | Kollur, Ramallakota, Vajrakarur (Andhra Pradesh/Telangana) | Koh-i-Noor, Regent, Hope, Orlov |
| The Central Group | Panna (Madhya Pradesh) | Shah Diamond, Panna diamonds |
| The Eastern Group | Sambalpur/Mahanadi Basin (Odisha) | Historical references to “large river stones” |
Famous Indian Diamonds and Their Heritage
The provenance of the world’s most celebrated diamonds can be traced back to the alluvial mines of the Deccan.
- Koh-i-Noor (Mountain of Light): Originating from the Kollur mine, it passed through the Kakatiyas, the Delhi Sultanate, the Mughals, the Persians, the Afghans, the Sikhs, and finally the British Crown.
- The Hope Diamond: Famed for its rare blue color caused by boron traces, it was originally the “Tavernier Blue” before being recut.
- The Darya-i-Noor (Sea of Light): One of the largest pink diamonds in existence, currently part of the Iranian Crown Jewels.
- The Orlov Diamond: A large diamond shaped like half an egg, which once served as the eye of an idol in a Srirangam temple before being stolen and eventually reaching the Russian Imperial collection.
Ancient Mining Techniques and State Regulation
The extraction of diamonds was a highly organized industry subject to strict imperial oversight.
- State Monopoly: According to the Arthashastra, all precious gems were the property of the Crown. Large diamonds (usually over a certain weight) had to be surrendered to the royal treasury.
- Mining Process: Workers dug shallow pits in the gravelly soil near riverbanks. The earth was washed in large cisterns, and the residue was hand-sorted to find the raw crystals.
- Panna Mining (Madhya Pradesh): In the Bundelkhand region, the Panna mines have been active for centuries. The Maharaja of Panna traditionally controlled these mines, and they remain the only active diamond-producing region in India today.
Gemological Trivia for UPSC Prelims
- Adamantine Luster: The term used to describe the unique, brilliant shine of a diamond, a quality recognized by ancient Indian lapidaries as Tejas.
- Diamond Grading: Ancient Indians used a scale of “twelve flaws” to devalue stones, including inclusions that looked like “crow’s feet” or “clouds.”
- The Peacock Throne: Commissioned by Shah Jahan, it was estimated to contain 116 emeralds, 108 rubies, and the Koh-i-Noor, symbolizing the apex of Mughal diamond consumption.
- Vajra-Lepa: A special glue or coating mentioned in ancient texts used to set diamonds into ornaments without modern soldering.
- Current Status: Today, the National Mineral Development Corporation (NMDC) operates the Majhgawan mine in Panna, which is the only mechanized diamond mine in Asia. India, however, remains the global leader in diamond cutting and polishing, particularly in Surat, processing 11 out of 12 diamonds in the world.