NMDC Pulls 27.29-Carat Diamond From Panna, Second-Largest on Record

A 27.29-carat gem-quality diamond was pulled from a mine in central India on 15 September 2026, ranking as the second-largest stone ever recovered from the site.

The operator is NMDC Limited, and the location is the Panna Diamond Mining Project (Majhgawan mine) in Madhya Pradesh, South Asia’s only mechanised diamond mining operation. That singularity gives the recovery both its geographic and its commercial weight.

NMDC has placed a preliminary minimum value on the stone of approximately ₹1 crore, while trade experts in Panna and independent coverage put the likely market figure closer to ₹2 crore. Here is what the find means for the Panna project’s current production state, how the stone will be valued and sold, and where its limits as a signal lie.

A 27.29-carat gem: what NMDC recovered and what it is worth

The stone is a 27.29-carat natural gem-quality diamond with a distinctive S-shape, recovered on 15 September 2026 from the Majhgawan mine. That shape is not just an aesthetic detail; NMDC has factored it into the stone’s preliminary valuation alongside colour, carat weight, and clarity.

By weight, it is the second-largest gem-quality diamond ever pulled from the project. The record still belongs to a 34.37-carat stone found in 2010, which went on to realise ₹3.2 crore at auction.

What makes this recovery notable is its timing rather than its rank alone. A 13.16-carat gem in July 2026 was the site’s first major find after operations restarted in March 2024, which makes the September stone the second significant recovery inside three months.

NMDC’s Chairman and Managing Director, Amitava Mukherjee, framed the find in celebratory terms.

The recovery is a “significant milestone” and a “moment of pride” for the Panna project, said Amitava Mukherjee, Chairman and Managing Director of NMDC.

On valuation, there are two numbers worth holding side by side. NMDC’s initial minimum estimate sits at roughly ₹1 crore, while diamond trade experts quoted in local coverage and the Free Press Journal put the market figure at around ₹2 crore, with an indicative auction outcome in the ₹2-2.5 crore range.

The gap between the two matters to you as a reader tracking this stone. NMDC’s ₹1 crore figure is a floor, not a forecast, and the eventual hammer price will hinge on factors not yet publicly disclosed, including full grading and live auction competition.

Natural diamond price dynamics in the broader wholesale market matter here because they set the ceiling within which even exceptional gem-quality stones must be priced; a structurally weaker market for rough diamonds since 2022 compresses the upside that trade expert estimates can credibly support.

How NMDC’s auction process works for a stone like this

Before this diamond reaches a buyer, it moves through NMDC’s prescribed evaluation and auction process. Quality checks on colour, carat weight, clarity, and shape come first, and only after that does the stone proceed to auction proceedings.

No calendar date has been announced for the sale of this specific stone as of 17 September 2026. That absence is worth understanding rather than reading as a gap in the reporting.

The sequence from recovery to realised price runs roughly as follows:

• Recovery and initial classification of the stone as gem-quality
• Full quality evaluation across colour, clarity, carat weight, and shape
• Pricing assessment establishing a minimum and expected range
• Auction proceedings to determine the final realised price

As for format, NMDC has an established mechanism for selling Panna diamonds. In March 2022, the company e-auctioned 8,337 carats of rough Panna diamonds through an online platform, which points to e-auction as the likely route here, though NMDC has not confirmed the format for this particular stone.

The lack of a fixed timeline is not unusual for a high-value individual gem. It tells you NMDC treats exceptional stones with a deliberate, structured process rather than folding them into routine parcel sales, an approach that has historically produced stronger outcomes.

The final price will reflect more than any pre-auction estimate can capture. The “Panna diamond” brand premium, the stone’s cut potential, and live bidding dynamics will all feed into the number, which is why the ₹1-2 crore estimates are best read as a range rather than a settled figure.

What one exceptional diamond does (and does not) tell you about Panna

The genuine significance of this find is easy to appreciate. Panna is the only mechanised diamond mine in South Asia, carrying an installed nameplate capacity of 84,000 carats per year, with a post-resumption target of around 40,000 carats per year reported by IDEX Online.

The production reality is more sobering. Cumulative output reached roughly 6,000 carats through August of FY2027 (April to August 2026), against a backdrop of zero production across nearly three fiscal years before operations resumed in March 2024.

The gap between the 84,000-carat nameplate capacity and the 6,000 carats produced in the first five months of FY2027 is the number to hold alongside the excitement of a 27.29-carat find. It frames where Panna actually sits in its recovery, not where its infrastructure suggests it could sit.

Here is the interpretation error to avoid. A single high-value stone creates episodic, windfall-driven revenue and says almost nothing about average ore grade, operating cost per tonne, or production trajectory. The metrics that matter for the asset are consistent annual carat output, regulatory continuity, and throughput.

For context on scale, a 2025 Swarajya article, citing NMDC data, notes that over 13 lakh (1.3 million) carats have been mined at Panna across the project’s lifetime. A record stone lifts one auction’s proceeds; it does not shift that longer arc.

Regulatory risk: the variable that production data alone cannot capture

Operations at Majhgawan have been halted repeatedly over the past 50 years due to concerns raised by India’s National Board for Wildlife, according to IDEX Online and Israeli Diamond Industry reports. Those stoppages have produced prolonged stretches of zero output.

India’s mining productivity barriers, including chronic delays in clearance cycles and regulatory bottlenecks that have halted operations at sites like Majhgawan multiple times, represent the structural backdrop against which Panna’s restart and any sustained output growth must be assessed.

This is the foundational variable. Regulatory continuity, not the quality of any individual diamond, is the condition that would allow Panna to make a sustained contribution to NMDC’s earnings.

Panna sits within a specific corporate identity. NMDC is a Navratna public sector undertaking and India’s largest iron-ore producer, and Panna is its sole non-iron-ore mining venture of scale, a genuine diversification asset within that portfolio.

Panna sits within a specific corporate identity. NMDC is a Navratna public sector undertaking and India’s largest iron-ore producer, and NMDC’s diversification strategy, which extends beyond coal into non-ferrous assets like Panna, reflects an institutional push to reduce the near-total revenue concentration in iron ore.

Two meaningful gem-quality recoveries in three months, after years of darkness, is a signal worth noting. Mukherjee has publicly tied the find to India’s mineral potential, but no brokerage or analyst note has commented on the stone’s impact on NMDC’s share valuation, and the diamond project remains a secondary contributor to group earnings.

Two finds in three months: reading Panna’s early signals with the right benchmarks

The real news beneath the headline weight is the sequence. The 27.29-carat stone is the second notable gem-quality recovery in three months from a project that sat idle for nearly three fiscal years, and that cadence, not the carat count, is what to watch.

The numbers keep expectations grounded. The 6,000 carats produced through August imply an annualised run-rate of roughly 14,400 carats, well short of the 40,000-carat post-resumption target. Panna is operating, but it has not yet reached even its conservative ambition.

Global diamond supply contraction, visible in the De Beers ownership transition and broader producer-level restructuring across 2026, is the market condition within which Panna’s resumed output arrives, and that tighter supply environment is one reason trade experts place the auction estimate above NMDC’s own floor valuation.

Three forward indicators will tell you whether the restart is gaining genuine traction:

1. Quarterly carat output tracking toward the 40,000 carats per year target
2. Uninterrupted regulatory clearance from the National Board for Wildlife
3. Multiple auction price realisations, rather than one exceptional stone

For NMDC’s overall investment case, iron ore remains the dominant driver. Panna is optionality worth watching, not a transformation of the business.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results. Financial projections are subject to market conditions and various risk factors.